# microgram

> English word · Noun

## Definitions
1. An SI unit of mass equal to 10⁻⁶ grams. Symbol: μg A unit of mass equal to one millionth of a gram, or 0.000 001 grams.

## Etymology
From micro- + gram.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/microgram