/ Dictionary / Index G gram atom: Meaning and Definition of Find definitions for: gram' at"om Pronunciation: (gram'u-tom'ik, -tom"-). [key] — Chem. Chem. the quantity of an element whose weight in grams is numerically equal to the atomic weight of the element. Also calledCf. Avogadro's number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gramarye gram calorie Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language