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Definition of Relative molecular mass
1. Noun. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule.
Exact synonyms: Molecular Weight
Generic synonyms: Mass
Category relationships: Chemical Science, Chemistry
Generic synonyms: Mass
Category relationships: Chemical Science, Chemistry
Medical Definition of Relative molecular mass
1. The sum of the atomic weight's of all the atoms constituting a molecule; the mass of a molecule relative to the mass of a standard atom, now 12C (taken as 12.000). Relative molecular mass (Mr) is the mass relative to the dalton and has no units. See: atomic weight. Synonym: molecular mass, molecular weight ratio, relative molecular mass. (05 Mar 2000)