nanogramn.
/ˈnanə(ʊ)ɡram/, U.S. /ˈnænoʊˌɡræm/ Chiefly Science.
One thousand-millionth of a gram. Abbreviated ng.
ΚΠ
1951 Nature 8 Dec. 1008/2 Most microanalytical needs are satisfied by the subunits milligram and microgram. This sequence has now been extended by the nanogram (ng = 10−9 g) and picogram (pg = 10−12 g).
1964 W. G. Smith Allergy & Tissue Metabolism vii. 76 In man, 108 platelets contain 60 nanograms (0·06 mg.) of serotonin.
1975 B. L. Williams & K. Wilson Biologist's Guide to Princ. & Techniques Pract. Biochem. i. 16 Response of isolated organs to nanogramme quantities of active substances has been obtained by this technique.
1999 New Scientist 3 Apr. 23/1 One sample of rainwater contained almost 4000 nanograms per litre of 2,4-dinitrophenol, a widely used pesticide.
This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022).
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n.1951