/ Dictionary / Index G gram molecule: Meaning and Definition of Find definitions for: gram' mol"ecule Pronunciation: (gram"mu-lek'yu-lur), [key] — Chem. Chem. that quantity of a substance whose weight in grams is numerically equal to the molecular weight of the substance. Cf. Avogadro's number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gram-molecular weight Grammy 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