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quicklime (n.)

"caustic lime, lime not yet slaked with water," late 14c., from quick (adj.) "living" + lime (n.1). A loan-translation of Latin calx viva. So called perhaps for being unquenched, or for the vigorousness of its qualities; compare Old English cwicfyr "sulfur."

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Definitions of quicklime from WordNet

quicklime (n.)
a white crystalline oxide used in the production of calcium hydroxide;
Synonyms: calcium oxide / lime / calx / calcined lime / fluxing lime / unslaked lime / burnt lime
From wordnet.princeton.edu