What does MR stand for?

Air Mauritanie - Mauritania - ICAO designator (ICDA)

Application for Writ of Mandamus Refused - Legal term (DLA)

Machine Records

Machine Rifle

Machinery Repairman - Navy rating

Macrophage Rich

Madras Railway - Indian Railway (TIR)

Magister - Master - Latin (ROG)

Magnetic Recorder (DEN)

Magnetic Resonance

Magnetic Resonating (AD)

Magnetoresistive - Computer science (FOTI)

Magnitude of Rotation

Mail and Records Group (SAUO)

Maine Rail - Federal Railroad Administration identification code

Main Ring (SAUS)

Maintainability Report

Maintenance Ratio (MCD)

Maintenance Release - Telecommunications (ACOL)

Maintenance Request (TIMI)

Maintenance Review

Management Requirements (MCD)

Management Reserve (MCD)

Management Review (SAUO)

Mandatory Reporting (HEAS)

Mandelate Racemase - An enzyme

Maneuver Radius (ACAE)

Manfred Radius - Air show performer (ASPC)

Manifest Refraction (SAUS)

Manitoba Law Reports - Canada - A publication (DLA)

Mannose Resistant - Biochemistry

Manpower Requirements

Manual Removal - Medicine

Manufacturer's Representative

Manufacturing Requisition

Map Reading

Map Reference

Marble (AAG)

Marburg - Lahn - German license plate city code

Marca Registrada - Registered Trademark - Spanish

March

Marginal Return - Army (AABC)

Marginal Revenue - Economics

Marianist Sisters (TOCD)

Mariner (ACAE)

Maritime Reconnaissance (NATG)

Maritime Regiment

Marker Ranger (SAUS)

Marketing Research Division - of AMS, Department of Agriculture

Market Rate (SAUO)

Mark Russell (AD)

Marston Radiators Ltd. (SAUO)

Martin Research, Inc. - Commercial firm

Mask Register

Massachusetts Review: A Quarterly of Literature, the Arts and Public Affairs - A publication (ANEX)

Master - British military (DMA)

Master of the Rolls

Master Relay - Electrical (DICI)

Master Reset (MCD)

Master Routing (SAA)

Material Request - or Requisition (MCD)

Material Review - Aviation (AAG)

Materiel Readiness - Army

Mate's Receipt

Mathematical Review (SAUO)

Matted Rib - Gunnery

Mauritania - ANSI two-letter standard code (CNC)

Mauritania - Federal Information Processing Standard (FIPS) country code (GEON)

Mauritius Decisions - A publication (DLA)

Mauritius Reports - A publication (DLA)

Maximal Response

Maximum Range (IAA)

Maximum to Right (SAUS)

May Repeat - Medicine

McCloud River - Railroad (MHDW)

McCloud River Railroad Co. (SAUO)

Mean Radius (MCD)

Mean Rate (SAUS)

Measles, Rubella - Immunology

Measured Rating - IOR - Yacht racing

Mechanical Restraint - for mental patients - British

Medial Rectus - Eye anatomy

- The Media Report - A publication (NTCM)

Medical Record

Medical Rectus - Muscle - Anatomy

Medical Report

Medium Range

Medium-Range Planes - Navy

Medium Rare - Culinary arts

Medium Reduction (NITA)

Medium Release (WDAA)

Medium Resolution

Medium-Riser - Automotive engines

Medullary Ray - Botany (BARN)

Megarayleigh - Optics

Melkersson-Rosenthal - Syndrome - Medicine (DB)

Memorandum for Record - Military (AFM)

Memorandum Receipt - Military (MUGU)

Memory Read - Computer science

Memory Recall - Computer science

Memory Reclaimer

Memory Register - Computer science

Mental Retardation

Mental Retardation Program - Public human service program (PHSD)

Mercury-Redstone - NASA

Message Register (AAG)

Message Repeat

Message Retrieval - Open Systems Interconnection (ODAA)

Metabolic Rate

Metallica Resources - Toronto Stock Exchange symbol - Canada

Metal Removing Co. (SAUO)

Meter

Meter-Handling Residential - Electric utility company

Methacholine Response - Medicine

Methane Recovery (CARB)

Methane Response - Automotive emissions

Methodist Review (SAUO)

Methyl Red - A dye

Methyl Reductase - An enzyme

Metropolitan Railway - British

Metropolitan Railway Co. (SAUO)

Michael Resources Ltd. - Vancouver Stock Exchange symbol

Michigan Reformatory (AD)

Microfilm Review (SAUO)

Microminiature Relay

Microplate Reader - Computer science

Microwave Radiometer (ACAE)

Middle Repetitive - Genetics

- The Middlesex Regiment - British

Mid-Engine, Rear-Drive - Automotive engineering

Midland Railway - British

Midland Railway Co. (SAUO)

Midland Red Bus Co. (SAUO)

Midrib - Botany

Migration Ratio (DNAB)

Military Railroad (AD)

Military Readiness

Military Region - Viet Cong term

Military Regulation

Military Representative (NATG)

Military Requirement

Military Review (MCD)

Militia Reserve - British military (DMA)

Milk-Ring - Test - Medicine (MEDA)

Milliradian (DEN)

Millirem (DEN)

Mill Run - Unselected lot of a manufactured product

Milrinone - Biochemistry

Mine Rake (DWSG)

Mineralo-Corticoid Receptor - Endocrinology

Mineralogical Record - A publication (AD)

Mineral Range Railroad (IIA)

Mineral Rubber

Mine-Run

Miniatures Rules (VLIE)

Minimum Required

Mining Reports, Edited by R. S. Morrison - Chicago - A publication (DLA)

Mining Review - A publication

Mini Registry (EA)

Minister of Reconstruction (SAUO)

Minister-Residentiary - Diplomacy

Ministry of Reconstruction - World War I - British

Minnesota Review - A publication (BRI)

Minor Repair (MCD)

Mi Remesa - My Remittance - Spanish - Business term

Miscellaneous Report

Missed Recognition (SAA)

Missile RADAR - Military (CAAL)

Missile Receiver

Missile Reference

Missile Rounds (MCD)

Missionarius Rector - Missionary Rector - Latin

Mission Radius (MCD)

Mission Ready - Aircraft

Mission Reliability

Mission Report - NASA

Mission Requirements (ACAE)

Mister

Mistura - Mixture - Pharmacy (ROG)

Mitochondriarich - Cytology

Mitral Reflux - Cardiology (MAE)

Mitral Regurgitation - Cardiology

Mittleres Reich in Aegypten - A publication (BJA)

Mixture Ratio (KSC)

Mobility Required - Civil Service

Mobilizacion Republicana - Republican Mobilization - Nicaragua - Political party (AD)

Mobilization Regulation - Army

MODEM Ready - Computer science

Moderately Resistant - Plant pathology

- The Modern Reader's Bible (1907) - A publication (BJA)

Modification Request - or Requirement

Modified Road (SAUO)

Modular Redundancy

Modulation Rate (DB)

Modulation Response

Moisture Resistant (IEEE)

Molar Refraction

Molecular Replacement - Crystallography

Moment of Resistance

Mondcivitan Republic - Defunct (EAIO)

Monitor Read

Monitor Recorder

Monon Railroad (AD)

Monthly Rental (VLIE)

Monthly Report

Monthly Review

Monticello Raceway, Monticello, N.Y. - Horse racing track

Moon Rise (DNAB)

Morelos - NCIC Mexican state code (NCIC)

Morgan Refractories Limited (SAUO)

Morgan's Foods, Inc. - AMEX symbol (SPSG)

Morning Report - Army

Moro's Reflex - Medicine (MELL)

Morris Register - An association (EAIO)

Mortality Rates

Mortality Ratio (MAE)

Motivation Research

Motormannes Riksforbund - Motorists' Association - Swedish (AD)

Motor Reduction

Motor Rifle (CCCA)

Mounted Rifles (SAUO)

Mounted Route (TBD)

Movement Region (SAUO)

Multifamily Residential Zone (AD)

Multi-Mirror Reflector - Lamp

Multiple Requesting - IBM Corp.

Multiplier Register

Multi-Reflecton - Lighting

Multi-Role (SAUS)

Municipal Reform - or Reformer

Municipal Reform Party (SAUO)

Muscle Receptor - Medicine (DMAA)

Muscle Relaxant - Medicine (DMAA)

Music Records - Record label

Muster Report

Mutual Recognition

Mutual Responsibility - Movement within Anglican Communion to make its mission more efficacious

Mycorrhizal Roots - Botany

Radiolocation Mobile - FCC radio station class code (FCCC)

Radiolocation Mobile Station - ITU designation

Reading Public Library, Reading, MA - Library symbol - Library of Congress (LCLS)

March (RION)

Master (AD)

Mister (WDAA)

Mobile Revertant - Bacteriology

Mother (AD)

Relative Molecular Mass (DOG)

Machine Record (AD)

Machine Rifle (AD)

Map Reference (AD)

Marginal Revenue (AD)

Medium Range (AD)

Meester - Master - Dutch (AD)

Mentally Retarded (AD)

Metabolic Rate (AD)

Methyl Red (AD)

Millirem - Emergency Management (EMA)

Milliroentgen

Mill Run (AD)

Mineral Rubber (AD)

Mine Run (AD)

Moisture Resistant (MIST)

Morocco - MARC country of publication code - Library of Congress (LCCP)

Motivational Research (AD)

Red Sea and Area - MARC geographic area code - Library of Congress (LCCP)