/ Dictionary / Index G guanidine: Meaning and Definition of Find definitions for: guan•i•dine Pronunciation: (gwan'i-dēn", -din, gwä'ni-), [key] — n. Chem. a colorless, crystalline, strongly alkaline, water-soluble solid, CHN, used chiefly in the manufacture of plastics, resins, rubber accelerators, and explosives. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Guangzhouwan guanine Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language