a unit of mass or weight equal to one millionth of a gram, used chiefly in microchemistry. Symbol: μg
Also especially British, mi·cro·gramme.
Origin of microgram1
Origin of microgram2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for microgram
It was balanced to a microgram—to a millionth of the combined weight of three aspirin tablets.Space Platform|Murray Leinster
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.