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one millionth (10−6) of a gram.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
µgMicrogram; 1x10–6 gram.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.