Dictionary.com
Thesaurus.com

milligram

American  
[mil-i-gram] / ˈmɪl ɪˌgræm /
especially British, milligramme

noun

  • milligrams
    plural
  1. a unit of mass or weight equal to one thousandth of a gram, and equivalent to 0.0154 grain. mg


milligram British  
/ ˈmɪlɪˌɡræm /

noun

  1. mg. one thousandth of a gram

"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

milligram Scientific  
/ mĭl′ĭ-grăm′ /
  1. A unit of mass or weight in the metric system equal to 0.001 gram.

  2. See Table at measurement


Other Word Forms

Noun Inflected Forms

Etymology

Origin of milligram

From the French word milligramme, dating back to 1800–10. See milli-, -gram 2

Vocabulary lists containing milligram

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.

See Examples For:

This makes it possible to use very small quantities of the metal, typically less than one quarter of a milligram per square centimeter.

From Science Daily ● Aug. 8, 2026

Novo has applied for approval of a 7.2 milligram single-dose pen in the EU and U.K., with a decision expected in the second half of the year.

From The Wall Street Journal ● Apr. 7, 2026

A 2.4 milligram dose of CagriSema was evaluated against 15 milligrams of tirzepatide.

From Barron's ● Feb. 23, 2026

“We’re now looking at a potential 0.4 milligram per container THC limit, which effectively would outlaw full-spectrum chapstick, pet treats — I mean, a lot of things that are not necessarily psychoactive,” Gilkey said.

From Salon ● Nov. 25, 2025

Its chain-reacting pile went live at the beginning of November and within six weeks was producing plutonium by the milligram, and soon by the gram.

From "Big Science" by Michael Hiltzik

Cans of popular drinks like Celsius, Ghost and Alani Nu have around 200 milligrams of caffeine, about twice as much as the average cup of coffee.

From The Wall Street Journal ● Sep. 15, 2026

Participants were randomly assigned to one of three dose groups: 45, 90 or 120 milligrams.

From Science Daily ● Aug. 10, 2026

On one day, each participant received 20 milligrams of cortisol.

From Science Daily ● Aug. 9, 2026

The boys started with .25 milligrams of Wegovy, then moved up to .5 milligrams and, in May, to a 1 milligram weekly shot.

From The Wall Street Journal ● Jun. 22, 2026

A worker bee is just over a centimeter long and weighs only about sixty milligrams; nevertheless, she can fly with a load heavier than herself.

From "The Secret Life of Bees" by Sue Monk Kidd

Vocabulary.com logo
by dictionary.com

Join 14,000,000 vocabulary learners

Start learning new words today on VocabTrainer.
You'll remember them forever.

Start training