picogramn.
/ˈpiːkə(ʊ)ɡram/, /ˈpʌɪkə(ʊ)ɡram/, U.S. /ˈpaɪkəˌɡræm/ Chiefly Science.
One million-millionth of a gram. Abbreviated pg.
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the world > matter > chemistry > units or measurements > [noun] > units of weight
picogram1951
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).
1975 B. L. Williams & K. Wilson Biologist's Guide to Princ. & Techniques Pract. Biochem. iii. 72 It has very high sensitivity and can detect as little as one picogramme of these compounds.
1983 Sci. Amer. June 62/2 The intent was to trap picoplankton: organisms whose wet weight is on the order of a picogram.
1997 Independent 15 May i. 2/4 Dioxin in two-month-old breast-fed babies is estimated to be 170 picogrammes/kg body weight when recommended tolerable intake is 10pg/kg bw.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1951