Definitions for nanogram
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Princeton's WordNet
nanogram, ng(noun)
one billionth (1/1,000,000,000) gram
Wiktionary
nanogram(Noun)
A unit of mass equal to 0.000 000 001 grams. Symbol: ng
Citation
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"nanogram." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/nanogram>.

