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nanogram

[nan-uh-gram, ney-nuh-]
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noun
  1. one billionth of a gram. Abbreviation: ng
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Origin of nanogram

First recorded in 1950–55; nano- + -gram2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for nanogram

nanogram

nanogramme

noun
  1. one billionth (10 –9) of a gramSymbol: ng
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

nanogram in Medicine

nanogram

(nănə-grăm′)
n.
  1. One billionth (10-9) of a gram.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.