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

---

milligram British  

/ ˈmɪlɪˌɡræm /

noun

1.  mg.  one thousandth of a gram

---

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

---

Etymology

Origin of milligram

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

Example Sentences

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

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