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
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.
London maintains an emissions limit of 40 micrograms per cubic meter of nitrogen dioxide. Jasmin Malik Chua, Sourcing Journal, 5 Feb. 2026 Most adults need about 900 micrograms of copper per day. Zia Sherrell, Health, 5 Feb. 2026 The ideal intake should be 400 micrograms a day, which can help reduce your risk of stroke and cardiovascular disease, according to Saba. Mara Santilli, Flow Space, 5 Feb. 2026 In October, the Air District lowered the threshold of fine particulate matter for declaring Spare the Air alerts from 35 to 25 micrograms per cubic meter. Carlos E. Castañeda, CBS News, 4 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 6 Feb. 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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