nanogram

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nan·o·gram

 (năn′ə-grăm′)
n. Abbr. ng
One billionth (10-9) of a gram.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

nanogram

(ˈnænəʊˌɡræm) or

nanogramme

n
(Units) one billionth (10–9) of a gram. Symbol: ng
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nanogram - one billionth (1/1,000,000,000) gram
metric weight unit, weight unit - a decimal unit of weight based on the gram
mcg, microgram - one millionth (1/1,000,000) gram
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
But the amount was about one-millionth of a nanogramme - so miniscule that both UK Athletics and the IAAF agreed that no offence had been committed and there was no case to answer.
Devonish did give a reading fractionally above the permitted limit in a test after a competition, but the amount was around one-millionth of a nanogramme and considered so minimal that both UK Athletics and the International Amateur Athletics Federation agreed that no offence had occurred and there was no case.
Researchers from Britain and Spain found the Humber, in East Yorkshire, had most drugs at 303 nanogrammes a litre.
They found the Humber - which takes the effluent of about 20% of England's population - was the most polluted, with 303 nanogrammes of pharmaceuticals in every litre.