microgram

¹ American  

[mahy-kruh-gram] / ˈmaɪ krəˌgræm /

especially British, microgramme

noun

1. a unit of mass or weight equal to one millionth of a gram, used chiefly in microchemistry. μg

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microgram ² American  

[mahy-kruh-gram] / ˈmaɪ krəˌgræm /

noun

1. micrograph.

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Etymology

Origin of microgram¹

First recorded in 1885–90; micro- + -gram ²

Origin of microgram²

micro- + -gram ¹

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Example Sentences

See Examples For:

microgram

Even at their peak, lead levels barely surpassed 1 microgram per liter — well below the U.S.

From Los Angeles Times ● Mar. 20, 2026

"One microgram per meter cubed might sound fairly small, but we have to think about how people are exposed to wildfire smoke," Casey said.

From Science Daily ● Nov. 25, 2024

They found that peanut, cashew, hazelnut, walnut, milk, and sesame allergens were incredibly low in the SpoonfulOne food puffs: less than 1 microgram of food allergen per gram of food puff.

From Slate ● Feb. 6, 2023

Billings said these benefits are far greater if the standard was just one microgram per cubic meter lower — preventing up to 12,000 premature deaths.

From Salon ● Jan. 13, 2023

In the course of these investigations, balances that would weigh up to 10.5 mg with a sensitivity of 0.02 microgram were developed.

From A Brief History of Element Discovery, Synthesis, and Analysis by Glen W. Watson

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