"science of calculating the quantities of chemical elements involved in chemical reactions," 1807, from German Stöchiometrie (1792), coined by German chemist Jeremias Benjamin Richter (1762-1807) from Greek stoikheion "one of a row; shadow-line of a sundial," in plural "the elements" (from PIE *steigh- "to stride, step, rise") + -metry "a measuring of." Related: Stoichiometric.
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