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molec'ular weight'



Chem.
the average weight of a molecule of an element or compound measured in units once based on the weight of one hydrogen atom taken as the standard or on 1/16 the weight of an oxygen atom, but after 1961 based on 1/12 the weight of the carbon-12 atom; the sum of the atomic weights of all the atoms in a molecule. Abbr.: mol. wt. Also called formula weight.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

molecular spectrummolecule
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