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relative molecular mass

noun
1.
the sum of all the relative atomic masses of the atoms in a molecule; the ratio of the average mass per molecule of a specified isotopic composition of a substance to one-twelfth the mass of an atom of carbon-12 Mr, r.m.m. Former name molecular weight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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relative molecular mass in Science
relative molecular mass  
See molecular weight.
The American Heritage® Science Dictionary
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