milligram

American  

[mil-i-gram] / ˈmɪl ɪˌgræm /

especially British, milligramme

noun

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

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milligram British  

/ ˈmɪlɪˌɡræm /

noun

1.  mg.  one thousandth of a gram

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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

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Etymology

Origin of milligram

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

Example Sentences

Diranersen slowed Alzheimer’s progression across all doses, with the 60 milligram dose showing the strongest cognitive benefits.

From Barron's • May 14, 2026

Approval of the higher 7.2 milligram dose of Wegovy means that doctors in the EU can now prescribe three 2.4 milligram injections in one sitting, once a week.

From The Wall Street Journal • Feb. 17, 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

The level is 0.032 milligram per kilogram of soil.

From Los Angeles Times • Jul. 2, 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