a unit of mass or weight equal to one thousandth of a gram, and equivalent to 0.0154 grain. Abbreviation: mg
Also, especially British, milligramme.

1800–10; < French milligramme. See milli-, -gram2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
milligram or milligramme (ˈmɪlɪˌɡræm)
mg one thousandth of a gram
[C19: from French]
milligramme or milligramme
[C19: from French]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1810, from Fr. milligramme; see milli- + gram.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

milligram mil·li·gram (mĭl'ĭ-grām')
Abbr. mg
A metric unit of mass equal to one thousandth (10-3) of a gram.

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
milligram   (mĭl'ĭ-grām')  Pronunciation Key 
A unit of mass or weight in the metric system equal to 0.001 gram. See Table at measurement.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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