Meaning

verb heat a substance so that it oxidizes or reduces

originThe verb is derived from Late Middle English calcinen (“(alchemy, medicine) to heat (something) until it turns to powder; to change the nature of (something) by heating”) [and other forms], from Old French calciner (modern French calciner (“to calcinate; to calcine”)) and from its etymon Medieval Latin calcināre (“(alchemy) to burn like lime; to reduce to calx”), from Late Latin calcīna…

Etymology from Wiktionary, CC BY-SA 3.0