/ Dictionary / Index N nanogram: Meaning and Definition of Find definitions for: nan•o•gram Pronunciation: (nan'u-gram", nā'nu-), [key] — n. one billionth of a gram. Abbr.: ng Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nanogram (Thesaurus) nano- nanoid Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language