equivalent weight

American  

noun

Chemistry.

1. the combining power, especially in grams gram equivalent, of an element or compound, equivalent to hydrogen as a standard of 1.00797 or oxygen as a standard of 8; the atomic weight divided by the valence.

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equivalent weight British  

noun

1. Also called: gram equivalent.  the weight of an element or compound that will combine with or displace 8 grams of oxygen or 1.007 97 grams of hydrogen

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Etymology

Origin of equivalent weight

First recorded in 1925–30