Air-Cushion Vehicle built by Mitsubishi - Japan - Usually used in combination with numerals
Fe3O4-Fe2O3 buffer (SAUS)
- A Grammar of Masoretic Hebrew - A publication (BJA)
Ha-Mo'atsah ha-Hakla'it (BJA)
Harvard University, Cambridge, MA - Library symbol - Library of Congress (LCLS)
Maclean Hunter Publishing Company (EFIS)
Magdalen Hospital (SAUO)
Magnetic Head - or Heading
Magnetite-Hematite - Geology
Mail Handler - Computer science
Main Hatch
Maintenance Handbook
Maintenance Hemodialysis - Nephrology (CPH)
Major Hangover - Internet lingo (NETL)
Makkabi Hazair (BJA)
Malaysia Airlines - Airline flight code (ODBW)
Malaysian Airline System - ICAO designator (AD)
Malden Hospital - Malden, MA
Maleic Hydrazide - Plant growth regulator
Malignant Histiocytosis - Medicine
Malignant Hyperpyrexia - Medicine
Malignant Hypertension - Medicine (DMAA)
Malignant Hyperthermia - Medicine
Malt House
Mammotropic Hormone - Endocrinology
Manhole (AAG)
Man-Hour (MCD)
Man Hours (EAGT)
Mannoheptulose (DB)
Manual Hold - Telecommunications
Manufactured Housing (PA)
Manufacturers Hanover Corp. (EFIS)
Manufacturers Hanover Trust Co. (SAUO)
Mare Humorum - Sea of Moisture - Lunar area
Marital History
Marshall House - Commercial firm
Marshall Islands - ANSI two-letter standard code (CNC)
Marshall Islands - NCIC American territory possession code (NCIC)
Masonic Hall (ROG)
Mass Hysteria - Medicine (EDAA)
Master Herbalist
Master Hosts - An association - Defunct (EA)
Master of Hamburgerology - McDonald's Corp. Hamburger University
Master of Harriers - British (WDAA)
Master of Health
Master of Horticulture
Master of Hounds - British
Master of Humanics
Master of Humanities
Master of Hygiene
Master of the Horse - British (ROG)
Master of the Hunt
Materials Handling (NATG)
Maximum Height - Ballistics
MCS - Maneuver Control System HTU - Hand-held Terminal Unit - Military technology (DDF)
Mechanical Handling - Describes type of produce; for example, MH-1 refers to a kind of tomato
Medal of Honor - Often erroneously called Congressional Medal of Honor - Military decoration
Medal of Honour (SAUO)
Medial Hypothalamus - Medicine (DMAA)
Medical History
Medium Power Homing (PIPO)
Megahertz - Megacycles per second - See also MCPS, MCS, MC/S, MHZ (NATG)
Meierhof - Dairy farm (GIS)
Melanophore Hormone - Also, MSH - Endocrinology
Melanophore-Stimulating Hormone - Medicine (DMAA)
Mended Hearts (EA)
Menstrual History - Medicine
Mental Health
Mental Hygiene (DMAA)
Mentally Handicapped (AIE)
Merchants Haulage (DS)
Mercurihematoporphyrin - Pharmacology
Meristem Height - Botany
Merphyrin - Medicine (EDAA)
Merwin & Hubert - NCIC firearms make code (NCIC)
MeSH Heading - Online database field identifier
Message Handler - Computer science
Metal Halide (MCD)
Microhematuria - Medicine
Middle Hebrew - Linguistics (IEL)
Middlesex Hussars (Duke of Cambridge's) - British military (DMA)
Migraine Headache (MELL)
Military History (AABC)
Military Hospital (ADA)
Minehunter (SAUS)
Ministry of Health - British
Ministry of Housing (SAUO)
Miscellaneous Hardware
Mishnaic Hebrew - Linguistics (IEL)
Mitsubishi Heavy Industries Ltd. - Japan - ICAO aircraft manufacturer identifier (ICAO)
Mobile High-Power - Reactor - Proposed (NRCH)
Mobile Home (WGA)
Mobile Host (SAUS)
Mobility Haiti (EA)
Modern Healthcare - Medicine - Journal (EDAA)
Modified Huffman (SAUO)
Modified Huffman code
Moist Heat (STED)
Molting Hormone - Endocrinology, entomology
Monosymptomatic Hypochondriasis - Medicine (DMAA)
Montserrat - GeoNet country code (GEON)
Morgagni Hernia - Medicine (MELL)
Most High - Freemasonry
Most Honorable
Mostly Harmless (SAUS)
Mountain Hemlock - Lumber (WOHB)
Mount Hood Railway Co. - AAR code
Mt. Hyjal
Much - Telegraphy (PCTE)
Muelheim - Ruhr - German license plate city code
Mulberry Heart (OA)
Multihandicapped
Multiple Handicapped (STED)
Murine Hepatitis
Music Hall - Record label
Mutant Hybrid - Medicine (DMAA)
Muzzle Hatch
Myocardial Hypertrophy - Medicine (MELL)
Myohyoid - Medicine (DMAA)
Mehri (BJA)
Macao - MARC country of publication code - Library of Congress (LCCP)
Millihenry (AEBE)
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