Atomic weight Meaning, Definition & Usage

  1. noun (chemistry) the mass of an atom of a chemical element expressed in atomic mass units
    atomic mass; relative atomic mass.

WordNet

Definitions
  1. . (Chem.) See under Atomic, and cf. Element.
Definitions
  1. (Chem.), the weight of the atom of an element as compared with the weight of the atom of hydrogen, taken as a standard.

Webster 1913