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Synonyms

mg

1 American  

  1. milligram; milligrams.

Mg 2 American  

abbreviation

Music.

  1. left hand.

Mg 3 American  
Symbol, Chemistry.

  1. magnesium.

MG 4 American  

  1. machine gun.

  2. major general.

  3. military government.

  4. myasthenia gravis.

MG 1 British  

abbreviation

  1. machine gun

"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
mg 2 British  

abbreviation

  1. Madagascar

"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
mg 3 British  

symbol

  1. milligram

"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
Mg 4 British  

symbol

  1. magnesium

"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
mg Scientific  

  1. Abbreviation of milligram

Etymology

Origin of Mg

From French main gauche

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Even reducing intake by 1,000 mg per day can lead to meaningful improvements in blood pressure and overall heart health.

From Science Daily • Mar. 31, 2026

The company said its higher dosage Wegovy medication contains 7.2 milligrams of semaglutide, injected once weekly, and it complements Wegovy’s medication containing 2.4 mg semaglutide.

From The Wall Street Journal • Mar. 19, 2026

If you instead go for Taco Bell’s under-eye masks, just drink plenty of water with your Taco Bell Nachos BellGrande, which is high in fat and has more than 1,100 mg of skin-dehydrating sodium.

From Los Angeles Times • Mar. 18, 2026

The biotech company said patients taking aleniglipron for 11 months in a Phase 2 trial had placebo-adjusted weight loss of 16.3% for the 180 mg dose and 16.0% for the 240 mg dose.

From MarketWatch • Mar. 16, 2026

In these examples, look at the phrase containing the mg word and look at whodunit.

From "Woe Is I" by Patricia T. O'Conner

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.