nanograms From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounA unit of mass equal to 0.000 000 001 grams. Symbol: ng Related wordsSynonymsnanometersnanometrenanometermicrogramgramsmilligramnanoscalenanotechnanismcentigrammilligrammenanoparticlenanotechnologydecigramnanosecondnanotube References Wiktionary — nanograms Wikipedia — nanograms