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 Reducing just 5 micrograms per cubic meter (µg/m3) of fine particle pollution can decrease the risk of low birthweight by 15%. Jeremy Ney, TIME, 9 Apr. 2024 In 2021, the EPA decided to reconsider its decision to keep the annual standard for the pollution at 12 micrograms per cubic meter. The Arizona Republic, 26 Mar. 2024 In Bangladesh, where government guidelines are set at a less-strict 50 micrograms, millions of people are believed to have been affected. Laura Paddison, CNN, 22 Mar. 2024 For these reasons, the CDC recommends that all women of reproductive age consume at least 400 micrograms of folic acid daily. Casey Seiden, Parents, 22 Mar. 2024 The consultant found relatively high concentrations of nicotine and estimated the smoke particulate concentration to be 339 micrograms per cubic meter, according to a report shared with The Post. Danny Nguyen, Washington Post, 15 Mar. 2024 The children affected by this recall had 4 to 29 micrograms per deciliter. Julia Gomez, USA TODAY, 29 Jan. 2024 Around 57 million people were exposed to levels that breached the WHO’s 10 microgram guidelines, the study found — roughly 45% of the population. Laura Paddison, CNN, 22 Mar. 2024 The Environmental Protection Agency (EPA) has primary annual average standards of 12.0 micrograms per cubic meter. Marina Johnson, The Courier-Journal, 20 Mar. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'microgram.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


International Scientific Vocabulary

First Known Use

circa 1890, in the meaning defined above

Time Traveler
The first known use of microgram was circa 1890

Dictionary Entries Near microgram

Cite this Entry

“Microgram.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microgram. Accessed 13 Apr. 2024.

Medical Definition


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

More from Merriam-Webster on microgram

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