Various names for the mass in grams of a substance that would react with or replace one gram of hydrogen. See: Equivalent, the shorter name now used in many contexts for this unit
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}