nanogramn.

Brit.

/ˈnanə(ʊ)ɡram/, U.S.

/ˈnænoʊˌɡræm/

Forms: 1900s– nanogram, 1900s– nanogramme.

Origin: Formed within English, by compounding. Etymons: nano- comb. form, gram n.²

Etymology: < nano- comb. form + gram n.²

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).

单词	nanogram
释义	nanogramn. Brit. /ˈnanə(ʊ)ɡram/, U.S. /ˈnænoʊˌɡræm/ Forms: 1900s– nanogram, 1900s– nanogramme. Origin: Formed within English, by compounding. Etymons: nano- comb. form, gram n.² Etymology: < nano- comb. form + gram n.² 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). < n.1951
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