Please enter a keyword to search or click a letter below to browse the list of abbreviations and definitions through our glossary index.


Search Results for M
  • Measurement (ton of 35,3 cubic feet) or Meter 
  • M/D 
    Months after date or Malicious damage 
  • M/E or ME 
    Main Engine 
  • M/M 
  • M/M or MIN/MAX 
    Minimum / maximum 
  • M/R 
    Mate’s receipt 
  • M/S 
    Motor Ship or Mate's Receipt 
  • M/V 
    Motor vessel/merchant vessel 
  • M/V or MV 
    Motor Vessel 
  • M/Y 
    Motor yacht 
  • M/Y or MY 
    Motor yacht 
  • MAA 
    Mina Al Ahmadi 
  • Macro-Bridge 
    Also known as "land bridge:. It is the same as mini-bridge, except that it involves substitution of land transportation across the United States in place of water service, for traffic that originates and terminates outside of the United States. 
  • Mainstay 
    A stay that extends from the maintop to the foot of the foremast of a sailing ship. Currently, a thing upon which something is based or depends. 
  • Maintenance Platform, jack up 
    A jack up offshore maintenance platform 
  • Maintenance Platform, semi Submersible 
    A semi submersible offshore maintenance platform 
  • MAK 
    Maximale ArbeitsplatzKonzentrationen (maximal occupational exposure concentrations) 
  • Malaccamax  
    Malaccamax is a naval architecture term for the largest size of ship capable of fitting through the 25 metres (82 ft)-deep Strait of Malacca. 
  • Malpractice 
    A carrier giving a customer illegal preference to attract cargo. This can take the form of a money refund (rebate); using lower figures than actual for the assessment of freight charges (undercubing); misdeclaration of the commodity shipped to allow the a
  • Mandamu 
    A writ issued by a court; requires that specific things be done. 
  • Manifest 
    a detailed summary sheet of all cargo being carried for each vessel trip; information also includes origin, destination, value, number, etc. 
  • Manifold 
    Area of a tanker featuring pipes and valves for intake and offloading of cargo. 
  • MAP 
    Mono-ammonium phosphate 
  • Margarines 
    Margarines are semi-solid or consistent fatty foods originally developed to imitate dairy butter. They therefore contain a proportion of emulsified aqueous phase similar to that found in butter. The amount of moisture permitted in margarine is limited by
  • Marine Insurance 
    Broadly, insurance covering loss or damage of goods at sea. Marine insurance typically compensates the owner of merchandise for losses sustained from fire, shipwreck, etc., but excludes losses that can be recovered from the carrier. 
  • Marine Oils 
    The first common source of marine oil was obtained from whales. Today, whale numbers have been reduced to insignificance. Various types of fish are caught for processing into meal and oil, for example, herring, menhaden and anchovy. After refining and par
  • Marine pollutant 
    Substances, articles or materials which, if released into the aquatic environment, may cause serious environmental damage. 
  • Maritime 
    Business pertaining to commerce or navigation transacted upon the sea or in seaports in such matters as the court of admiralty has jurisdiction. 
  • Maritime Domain 
    It is all areas and things of, on, under, relating to, adjacent to, or bordering on a sea, ocean, or other navigable waterway, including all maritime related activities, infrastructure, people, cargo, and vessels and other conveyances. 
  • Maritime Domain Awareness (MDA) 
    It is the effective understanding of anything associated with the global maritime domain that could impact the security, safety, economy, or environment of the United States. 
  • Maritime lien 
    A right in the propery of a ship, conferred by law for seamens wages, salvage, etc. 
  • Maritime Security and Safety Information System (MSSIS) 
    It shares and displays vessel Automated Identification System (AIS) data real–time with multiple international users through a web–based, password–protected system. 
  • Maritime Waterways 
    Inland waterways linked to the sea, basically used for the traffic of seagoing vessels and designated as such under national law 
  • Mark I 
    WW designation for ro-ro carriers built in 1978-79 
  • Mark II 
    WW designation for ro-ro carriers built in 1984 
  • Mark III 
    WW designation for ro-ro carriers built in 1996 
  • Mark IV 
    WW designation for ro-ro carriers built in 2000-01 
  • Market related 
  • Markets 
    Markets for oleochemicals continue to evolve, with niche markets developing continually. Nonetheless, the main end-use markets include building auxiliaries, candles, cleaning agents, cosmetics, detergents, fire extinguishing agents, flotation agents, food
  • Marking 
    Letters, numbers, and other symbols placed on cargo packages to facilitate identification. Also known as marks. 
  • Marlinespike 
    A pointed metal spike, used to separate strands of rope in splicing. 
    The abbreviated term for the International Convention for the Prevention of Pollution by Ships (MARine POLlution) The International regulations concerning the construction of vessels and procedures to be followed to prevent pollution of the sea by oil, no
  • MARPOL 73/78 
    International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 relating to the International Convention for the Prevention of Pollution from Ships, 1978  
  • Marpol Category 
    The Pollution Category (X, Y, Z) assigned to each product under Annex II of MARPOL 73/78. OS means the product was evaluated, and found to fall outside the categories X, Y, or Z. I indicates that the product is an Annex 1 product. 
  • MARPOL Pollution Category 
    This refers to the pollution categories designated in the “MARPOL 73/78” regulations: X to Z - Pollution category of the cargo as evaluated by MARPOL. “X” means highest environment impact OS - Pollution category is evaluated, but outside categories X to Z
  • MARS 
    Nautical Institute Marine Accident Reporting System 
  • MarView 
    It is an integrated, data–driven environment providing essential information to support the strategic requirements of the United States Marine Transportation System and its contribution to economic viability of the nation. 
  • Mass explosion 
    Explosion which affects almost the entire load virtually instantaneously. 
  • Master 
    An officer qualified to command a ship. Usually refers to the Captain. 
  • Master Inbound 
    U.S. Customs’ automated program under AMS. It allows for electronic reporting of inbound (foreign) cargoes in the U.S. 
  • Mate’s Receipt 
    An archaic practice. An acknowledgement of cargo receipt signed by a mate of the vessel. The possessor of the mate’s receipt is entitled to the bill of lading, in exchange for that receipt. 
  • MATS 
  • MAX 
    Max But As Close To As Possible 
  • MB 
    Merchant Broker 
  • MB/T 
    Motor blocks/ turnings 
  • MBL 
    Minimum Breaking Load 
  • MBM 
    Multi-Buoy Moorings 
  • MBM 
    1,000 board feet. One MBM equals 2,265 C.M. 
  • MBTE 
    Methyl tert-butyl ether 
  • MCFS 
    Master Container Freight Station. See CFS. 
  • MCO 
    Maximum continous output 
  • MCR 
    Maximum Continuous Rating - Maximum warranted power an engine can sustain under continuous operation. 
  • MCS 
    Maritime Security Code 
  • MCT 
    Medium-Chain Triglyceride. Triglycerides containing fatty acid chains of 6-10 carbon atoms which are readily absorbed by the body. 
  • MDO 
    Marine diesel oil 
  • MDO 
    Marine diesel oil 
  • MDO or DO 
    Marine diesel oil 
  • MDSE 
  • MDWT 
    Metric DeadWeight Tons 
  • ME 
    Main Engine 
  • MEA 
  • Measurement Cargo 
    Freight on which transportation charges are calculated on the basis of volume measurement. 
  • Measurement Ton 
    40 cubic feet. 
  • MECH 
  • Mechanical Lift Dock 
    A lifting dock facility using winches to lower and raise platform 
  • Mechanically Ventilated Container 
    A container fitted with a means of forced air ventilation. 
  • Mechanism of toxicity 
    The way in which a chemical alters basic biological functions and structures in order to exert its toxic effect(s) 
  • MED 
  • Medium-speed diesel 
    Moderately large diesel engines such as those which propel large boats and heavy-duty locomotives. These engines burn a heavy gasoil which sometimes takes their name. 
  • MEG 
    Middle East Gulf 
  • Megaports Initiative 
    It is a National Nuclear Security Administration (NNSA) initiative, started in 2003. It teams up with other countries to enhance their ability to screen cargo at major international seaports. The Initiative provides radiation detection equipment and train
  • MEK 
    Methyl Ethyl Ketone 
  • Melting 
    When heated sufficiently, a solid changes state to a liquid. The melting of a fat depends on its previous triglyceride composition. The baking or spreading performance of commercial fats depends greatly on their melting behaviour. Solid fat content measur
  • MEM 
  • MEMO 
  • Memorandum Bill of Lading 
    An in–house bill of lading. A duplicate copy. 
  • Memorandum Freight Bill 
    See Multiple Container load Shipment. 
  • MeOH 
    Methyl Alcohol = Methanol 
  • MEPC 
    Marine Environment Protection Committee 
  • Mercaptans 
    Mercaptan sulfur. Excessive concentrations of these malodorous organic sulfur molecules make motor gasoline unmerchantable. Blenders, therefore, want to know the mercaptan content of components they could consider buying. The kerosene trade pays careful a
  • merger 
    The joining of two or more (shipowning) companies 
  • MESA 
    Most Environmentally Sensitive Area 
    Messieurs or Gentlemen or Sirs 
  • Metacenter or transverse metacenter 
    Ship Stability: The highest point to which G may rise and still permit the vessel to have positive stability. Found at the intersection of the line of action of B when the ship is erect with the line of action of B when the ship is given a small inclinati
  • Metals content 
    A specification of concern to buyers of fuel oil and vacuum gasoil.Heavy metals, such as nickel, vanadium, and copper, poison cat-cracking catalysts.Most refiners specify a maximum metals limit for the catfeed and vacuum unit feedstock they would consider
  • Metaxylene 
    Metaxylene is an isomer of mixed xylene. It is used as an intermediate in the manufacture of polyesters for coatings, inks, reinforced plastics, and packaging applications. 
  • Meter 
    39.37 inches (approximately). 
  • Methaemoglobin generator 
    A substance capable of converting the oxygen carrying molecule (haemoglobin) in the red blood cell to an oxidized form (methaemoglobin), which has a reduced capacity to transport oxygen.  
  • Methane 
    A colorless, odorless, flammable gas that occurs abundantly in nature as the chief constituent of natural gas, as a component of firedamp in coal mines, and as a product of the decomposition of organic matter. Methane is used as a fuel and as a starting m
  • Methanol 
    Methanol, a colorless alcohol, is a chemical used in the production of formaldehyde, acetic acid and methyl methacrylate (MMA), and is used as a solvent in many applications. It is also used to produce MTBE. 
  • Methyl Esters 
    The fatty acid composition of an oil is normally determined by using Gas Liquid Chromatography of the fatty acid methyl esters (FAME analysis). The methyl ester derivatives of fatty acids are comparatively volatile. Methyl esters of fatty acids are conven
  • Methylamines 
    Methylamines (mono-, di- and tri) and their derivatives are alkaline substances that are produced by reacting ammonia and methanol, in the gas phase at high temperatures and high pressure. Methylamines are available as anhydrous liquefied gases and as aqu
  • Metric Ton 
    2,204.6 pounds or 1,000 kilograms. 
  • MEX 
  • MF 
    Medium Frequency 
  • MFAG 
    Medical First Aid Guide 
  • MFG 
  • MFRS 
  • MG/R 
  • MGA 
    Master''s general account 
  • MGO 
    Marine gas oil 
  • MGT 
  • MH 
    Main hatch 
  • MHE 
    Materials handling equipment 
  • MHHW 
    Mean Higher High Water 
  • MHI 
    Car carriers built at Mitsubishi Heavy Industries in 2004-06 
  • MHW 
    Mean High Water 
  • MHWN 
    Mean high water neaps: and 
  • MHWS 
    Mean High Water Spring Tides 
  • MIAP 
    Mortgagee interest additional perils pollution 
  • MIBK 
    Methyl Isobutyl Ketone 
  • MIC 
  • Micro-Bridge 
    Interior point intermodal service similar to mini-bridge, except that cargo originates or terminates at an inland city rather than another port city. The cargo moves on a single (ocean) bill of lading to and from the interior point and the port. 
  • Microbridge 
    A cargo movement in which the water carrier provides a through service between an inland point and the port of load/discharge. The carrier is responsible for cargo and costs from origin on to destina- tion. Also known as IPI or Through Service. 
  • MICS 
    Member of The Institute of Chartered Shipbrokers, London 
  • MID 
  • Mid-point 
    The temperature where 50 percent (weight or volume basis, as specified) of a natural material or refined product has boiled.Sometimes called 50 percent point. 
  • Middle distillates 
    Products heavier than motor gasolinenaphtha and lighter than residual fuel oil.This range includes heating oil, diesel, kerosene, and jet kero. 
  • Midship 
    Approximately in the location equally distant from the bow and stern  
  • MII 
    Mortgagee interest insurance  
  • Mile 
    A unit equal to 5,280 feet on land.A nautical mile is 6076.115. 
  • Mill Scale 
    A thick oxide coating formed on the steel when heated, e.g., in connection with hot working or heat treatment 
  • MIN 
    Minute or Minimum 
  • MIN/MAX 
    Minimum/Maximum (cargo quantity) 
    Minimum / maximum 
  • Minehunter 
    A naval vessel equipped for detecting explosive marine mines 
  • Minelayer 
    A naval vessel designed for laying marine mines 
  • Minesweeper 
    A naval vessel equipped for detecting, destroying, removing, or neutralizing explosive marine mines 
  • Mini Landbridge 
    An intermodal system for transporting containers by ocean and then by rail or motor to a port previously served as an all–water move (e.g., Hong Kong to New York over Seattle). 
  • Mini-Bridge 
    Substitution of rail or truck service for water transportation between two U.S. port cities for cargo originating or terminating in a port city. 
  • Minimum Bill of Lading 
    A clause in a bill of lading which specifies the least charge that the carrier will make for issuing a lading. The charge may be a definite sum or the current charge per ton for any specified quantity. 
  • Minimum Charge 
    The lowest charge that can be assessed to transport a shipment. 
  • Mining Vessel 
    A vessel equipped for offshore mining operations, most commonly diamonds 
  • MIO 
  • MIP 
    Marine insurance policy 
  • MISC 
  • Miscible 
    In this guidebook, means material that mixes readily with water. 
  • Mission Ship 
    A mobile vessel used for missionary work 
  • MITI 
    Ministry of International Trade & Industry (JP) 
  • Mixed Container Load 
    A container load of different articles in a single consignment. 
  • MKT 
  • ML 
    Motor launch 
  • MLB 
  • MLC 
    Meters of Liquid Column 
  • MLD 
  • MLLW 
    Mean low low water 
  • MLS 
  • MLW 
    Mean low water 
  • MLWN 
    Mean low water neaps. Average depths of water available at the times of low and of high tides during periods of Neap Tides 
  • MLWS 
    Mean Low Water Spring Tides 
  • MM 
    Marketing Manual 
  • MM 
    Engine Room (OCIMF acronym) 
  • mm 
  • MMA 
    Methyl Methacrylate. A chemical derived from propylene, used for the manufacture of polymethyl methacrylate and also for polymer dispersions and other resins. 
  • MMFB 
    Middlewest Motor Freight Bureau. 
  • MMPD 
    Maximum Most Probable Discharge 
  • MMS 
    APPE Monthly Monitoring of Monomers. APPE is a major group within the Association of Petrochemicals Producers in Europe (APPE). For more information, click here. 
  • MMSI 
    Maritime Mobile Selective Call Identity Code 
  • MNLO 
    Merchant Navy Liaison Officer 
  • MO 
    Managing Owner 
  • MOA 
    Memorandum of Agreement: A contract form specifying the terms and conditions covering the sale and purchase of a merchant ship 
  • MOD 
    Ministry of Defence 
  • Modified Atmosphere 
    A blend of gases tailored to replace the normal atmosphere within a container. 
  • MODU 
    Mobile Offshore Drilling Units 
  • Mogas 
    An abbreviation of motor gasoline. 
  • MOH 
    Medical Officer of Health 
  • Moisture 
    Since water is only very slightly soluble in fats, it is present only in small amounts and is referred to as moisture. Moisture in oils and fats may be determined by drying, distillation, absorption or titrimetry. The presence of water, especially when in
  • MOL 
    More or Less 
  • Molasses Tanker 
    A tanker for the bulk carriage of molasses 
    More Or Less CHarterers OPtion 
    More or less in Charterers option 
    More or Less Charterers Option 
  • MOLCO 
    More or less Charterers option 
  • Molecule 
    Chemical combination of two or more atoms of the same chemical element (such as O2 - which is Oxygen) or different chemical elements (such as H2O - which is water). 
  • MOLOO 
    More or less in owners' option 
  • Molten Sulphur Tanker 
    A tanker for the bulk carriage of molten sulphur in insulated tanks at a high temperature 
  • MOM 
  • Moment 
    Ship Stability: The product of two numbers, for example the force or weight moved multiplied by a distance 
  • MON 
    MONitors (fire) 
  • MON (Motor Octane Number) 
    A rating of the anti-knock properties of a finished motor gasoline or blendstock. The test determines MON simulates demanding engine operating conditions such as substantial loads and high speeds. The MON method yields lower numbers than the RON (research
  • Monoglyceride (Monoacylglycerol) 
    Monoglyceride is a compound used as an emulsifier in margarine/peanut butter etc, to help the uniform dispersion of oil in water. Monoglycerides do not occur naturally in appreciable quantities except in fats and oils that have undergone partial hydrolysi
  • Monomer 
    A molecule that can combine with others to form a polymer. 
  • Monomer 
    One molecular unit which links with others of its own or a similar kind to form a Styrene monomers, for instance, connect to form the familiar plastic, polystyrene. 
  • Monounsaturated 
    A fatty acid containing only one pair of carbon-carbon double bonds. 
  • Montreal Protocol 
    International agreement which aims to protect the ozone layer. Forms part of the UN Environmental Programme (UNEP)  
  • Mooring 
    An arrangement for securing a ship to a mooring buoy or pier 
  • Mooring Buoy 
    A mooring buoy 
  • Mooring Vessel 
    A vessel equipped to assist with the mooring and/or anchoring of larger vessels. Typically it will have a frame to prevent the ropes and chains fouling on the superstructure 
  • Mooring Vessel, Naval Auxiliary 
    A naval auxiliary vessel designed to assist with the mooring and or anchoring of larger vessels 
  • MOP 
    Muriate of Potash 
  • MOS 
  • MOS or MTHS 
  • MOT 
    Ministry of Transport or Monthly Overtime 
  • Motor alkylate 
    Full name of a gasoline blendstock often simply called alkylate. 
  • Motor gasoline 
    Petroleum-derived fuel blend intended to power spark-ignited internal combustion automobile engines. This propellant's boiling range can span C4 through 430 F. In practice, it usually has a somewhat lower end point. Mogas must meet various specifications
  • MOU 
    Memorandum of Understanding 
    Memorandum of Understanding (Paris) 
  • MP 
    Propylene Glycol Methyl Ether 
  • MPA 
    Propylene Glycol Methyl Ether Acetate 
  • MPG 
    Monopropylene Glycol. Produced by reacting propylene oxide with water. Monopropylene glycol is widely used for its solvent properties in the pharmaceutical, food, flavor and personal care industries. It is more widely used as an anti-freeze/de-icer, grind
  • MPG / USP 
    Pharmaceutical grade monopropylene glycol 
  • MPH 
    Miles per hour 
  • MPP 
    Multi-purpose (type of ship) 
  • MR 
    Medium Range (tanker): A vessel designed for carrying refined petroleum products in bulk tanks (25,000 dwt - 44,999 dwt approx). MR tankers primarily transport refined oil products on intra-regional routes between the oil refineries. Only on rare occasion
  • MRA 
    Marine Response Alliance 
  • MRNG 
  • MRX 
    Medium range cross-purpose tanker 
  • MS 
    Months after sight or Machinery survey 
  • MSA 
    Merchant Shipping Act or Mine Safety Appliances 
  • MSC 
    Manchester Ship Canal; Maritime Safety Committee 
  • MSDS 
    Material Safety Data Sheet 
  • MSG 
    Methacrylates Sector Group, a sector group of the Association of Petrochemicals Producers in Europe (APPE). For more information, click here. 
  • MSL 
    Mean Sea Level 
  • MSM 
    Minimum safe manning (flag states minimum approved manning for a vessel) 
  • MSO 
    Marine Safety Office (U.S. Coast Guard) 
  • MSP 
    A U.S. Department of Transportation program that helps to assure sufficient sealift to support the United States Armed Forces and U.S. emergency sealift needs, using commercial ships. 
  • MSRC 
    Marine Spill Response Corporation 
  • MSS 
    Maritime Safety and Security 
  • Mst 
  • MSV 
    Motor support vessel 
  • MT 
    Mean Time or Metric Tons 
  • MT or MTONS or MTS 
    Metric Tonnes 
  • MT, M.T. or M/T 
    Refers to any self-propelled tanker, i.e. tanker fitted with diesel engine for propulsion. 
  • MTBE 
    MTBE is not covered under the chemical code and thus is not subject to the exemptions for carriage of chemicals. MTBE has become a large trade and is often carried in oil vessels as well as chemicals ones. The product is volatile and there is no technic 
  • MTL 
    Mean tidal level 
  • MTO 
    Multimodal transport operator 
  • MTONS 
    Metric Tonnes 
  • MTOTS 
    Marine Terminal Operators Training System 
  • MTPA 
    Million metric tonnes per annum 
  • MTSA 
    The Maritime Transportation Security Act of 2002, is designed to protect ports and waterways from terrorists attacks. The law is the U.S. equivalent of the International Ship and Port Facility Security Code(ISPS), and was fully implemented on July 1, 2004
  • MTSC 
    Marine Technical Sub-Committee 
  • Multimodal 
    Synonymous for all practical purposes with “Intermodal.” 
  • Multipurpose ship 
    General cargo ship which can also carry containers 
  • MultiTank Container 
    A container frame fitted to accommodate two or more separate tanks for liquids. 
  • Munitions Carrier 
    A naval auxiliary Vessel for the carriage of munitions 
  • Museum, Stationary 
    A stationary vessel of interest preserved as a museum exhibit. 
  • Mutagen 
    An agent that causes biological mutation 
  • MV 
    Merchant Vessel: A vessel propelled by an engine 
  • MWC 
    Meter Water Column 
  • Myristic Acid 
    Myristic acid (C14:0) is a saturated intermediate chain length fatty acid found mainly in coconut, palm kernel and milk fats. It is also a minor constituent of most animal and vegetable fats. 
  • MBM 
    1,000 board feet. One MBM equals 2,265 C.M. 
  • Measurement Ton 
    40 cubic feet. 
  • Meter 
    39.37 inches (approximately). 
  • Metric Ton 
    2,204.6 pounds or 1,000 kilograms.