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one billionth (10−9) 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.

nan·o·gram (ng),

One billionth of a gram (10-9 g).
Farlex Partner Medical Dictionary © Farlex 2012


(ng) (nan'ō-gram)
One billionth of a gram (10-9 g).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


One billionth of a gram.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
Of 7,563 analyses, a total of 80 had abnormally high levels of PCBs (in excess of 200 nanogrammes per gramme of fat).
Rebagliati tested positive for 17 nanogrammes of marijuana per millilitre.
He stated that the smallest performance-enhancing dose given to a horse would be 50 milligrammes, the read-out for which in post-race testing would be five million nanogrammes.
The latest two names are understood not to be household names, but reports suggest in one of the latest alleged cases the athlete had 700 nanogrammes per millimetre (ng/mm) of nandrolone in his urine sample.
"We use in the region of what would be termed nanogrammes - each patient gets a thousand millionths of a gramme."