noun
the molecular weight of a substance expressed in grams; the basic unit of amount of substance adopted under the Systeme International d'Unites
• Hypernyms: ↑metric weight unit, ↑weight unit
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noun or gram-molecular weight : the mass of one mole of a compound equal in grams to the molecular weight — compare avogadro number, mole
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Chem.
that quantity of a substance whose weight in grams is numerically equal to the molecular weight of the substance. Cf. Avogadro's number.
[1890-95]
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gram molecule,
Useful english dictionary. 2012.