microgram

noun

mi·​cro·​gram ˈmī-krə-ˌgram How to pronounce microgram (audio)
: one millionth of a gram see Metric System Table

Examples of microgram in a Sentence

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Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Manganese is typically less than 50 micrograms per liter in water. — Noelle Phillips, Denver Post, 17 Apr. 2026 Adults older than 19 need 6-10 micrograms of vitamin B12 per day for brain health. — Christina Manian, Health, 14 May 2026 The table below spells them out in grams (g), milligrams (mg), micrograms (mcg), and international units (IU). — Lana Barhum, Verywell Health, 1 July 2026 Fatalities have been reported after consuming three to 58 micrograms per liter. — Alex Gurley, PEOPLE, 21 Apr. 2026 See All Example Sentences for microgram

Word History

Etymology

International Scientific Vocabulary

First Known Use

circa 1890, in the meaning defined above

Time Traveler
The first known use of microgram was circa 1890

Rhymes for microgram

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Browse Nearby Words

micrografting
microgram
microgranite
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Cite this Entry

“Microgram.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microgram. Accessed 7 Jul. 2026.

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Medical Definition

microgram

noun
mi·​cro·​gram ˈmī-krə-ˌgram How to pronounce microgram (audio)
1
: one millionth of a gram
2
: micrograph sense 1

More from Merriam-Webster on microgram

Britannica.com: Encyclopedia article about microgram

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