Also especially British, mil·li·gramme.

Origin of milligram

From the French word milligramme, dating back to 1800–10. See milli-, -gram2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for milligram

Historical Examples of milligram

British Dictionary definitions for milligram



  1. one thousandth of a gramSymbol: mg

Word Origin for milligram

C19: from French
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for milligram

also milligramme, 1802, from French milligramme; see milli- + gram.

Online Etymology Dictionary, © 2010 Douglas Harper

milligram in Medicine


  1. 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.

milligram in Science


  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.