Combining weight Meaning, Definition & Usage

  1. noun the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen
    equivalent; eq; equivalent weight.

WordNet

Definitions
  1. (Chem.), that proportional weight, usually referred to hydrogen as a standard, and for each element fixed and exact, by which an element unites with another to form a distinct compound. The combining weights either are identical with, or are multiples or multiples of, the atomic weight. See Atomic weight, under Atomic, a.

Webster 1913