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

Recent Examples on the Web
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Fortunately, however, the absolute energy of any individual particle-particle collision is tiny, corresponding to tiny fractions of a microgram’s worth of energy in terms of mass. Big Think, 5 Mar. 2026 This equates to about 40 micrograms of plastic per gram of tissue compared to 16 micrograms. Khloe Quill, FOXNews.com, 1 Mar. 2026 Recommendations from the National Institutes of Health (NIH) suggests women ages 19 to 70 aim to get 15 micrograms (or 600 international units) of vitamin D per day. Helen Carefoot, Flow Space, 26 Feb. 2026 The Centers of Disease Control and Prevention reports that exposure to chlorine, a flame retardant, at 60 micrograms per gram for 60 minutes or more through inhalation can lead to lung irritation and impaired function. Aude Konan, Scientific American, 11 Feb. 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

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Cite this Entry

“Microgram.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microgram. Accessed 9 Mar. 2026.

Medical Definition

microgram

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

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