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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Participants who got lower doses of LSD (25 or 50 micrograms) did no better than those who got a placebo. Jon Hamilton, NPR, 5 Sep. 2025 The strongest improvements came at the 100 and 200 microgram doses, with patients improving by about five to six points more than placebo. Dr. Christian S. Monsalve, ABC News, 4 Sep. 2025 The tolerable upper limit for adults is 100 micrograms (4,000 IU).2 If your vitamin D level is very low, your doctor may prescribe much higher doses. Health, 30 Aug. 2025 One of the newfound bitter substances activated the taste receptors even at the lowest concentration measured, 63.3 micrograms per liter. K. R. Callaway, Scientific American, 8 Aug. 2025 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 2 Oct. 2025.

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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