What does "microgram" mean?

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.

What is a synonym for "microgram"?

Common synonyms include: gamma, mcg, millimilligram, millimilligram, mul:mcg, mul:microg.

Microgram

Q: How do you use "microgram" in a sentence?

He says 17 of the hair samples showed worrying mercury contamination levels way above WHO limits of one microgram of mercury per kilogram of human body mass.

noun

noun ·3 syllables ·Rare ·Advanced level

Definitions

Noun

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.
"Holonyms: milligram < gram < kilogram < megagram < gigagram"
2
one millionth (1/1,000,000) gram wordnet

Synonyms

All synonyms

gamma mcg millimilligram millimilligram mul:mcg mul:microg

Example

More examples

"He says 17 of the hair samples showed worrying mercury contamination levels way above WHO limits of one microgram of mercury per kilogram of human body mass."

Etymology

From micro- + gram.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.