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Meaning of gram molecule

gram' mol"ecule

Pronunciation: (gram"mu-lek'yu-lur), [key]
— Chem. Chem.
  1. 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.