M 1'S

M-1

[em-wuhn]
noun, plural M-1's.
a semiautomatic, gas-operated, .30 caliber, clip-fed rifle, with a weight of 8.56 pounds (3.88 kg): the standard U.S. Army rifle in World War II and in the Korean War. See illus. under rifle.
Also called Garand rifle, Garand, M-1 rifle.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

M
from Gk. mu, from Semitic mem. The Roman symbol for 1,000; sometimes used in this sense in English 15c.-16c.; but in modern newspaper headlines it stands for million.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

m abbr.

  1. mass

  2. meter

M 2
abbr.

  1. molar

  2. molarity

  3. morgan

  4. myopia

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
m  
Abbreviation of mass, meter
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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