1 [mahy-kruh-gram]
a unit of mass or weight equal to one millionth of a gram, used chiefly in microchemistry. Symbol: μg
Also, especially British, microgramme.

1885–90; micro- + -gram2

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2 [mahy-kruh-gram]
micrograph ( def 2 ).

micro- + -gram1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

microgram mi·cro·gram (mī'krə-grām')

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The mouth washings had removed all but one microgram, an infinitesimal but nevertheless hazardous amount.
The units are microgram per kilogram body weight per day.
The first mouthful contained almost one-half microgram of plutonium.
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