microgram¹

[mahy-kruh-gram]

noun

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

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Also especially British, mi·cro·gramme.

Origin of microgram¹

First recorded in 1885–90; micro- + -gram²

microgram²

[mahy-kruh-gram]

noun

micrograph(def 2).

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Origin of microgram²

micro- + -gram¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for microgram

Historical Examples

It was balanced to a microgram—to a millionth of the combined weight of three aspirin tablets.
Space Platform
Murray Leinster

microgram in Medicine

microgram

(mī′krə-grăm′)

n.

A unit of weight equal to one-millionth (10-6) of a gram.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.