Etymology
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calorimeter (n.)

"apparatus for measuring heat given off by a body," 1794, from Latin calor "heat" (from PIE root *kele- (1) "warm") + -meter. A hybrid word. Related: Calorimetric; calorimetry.

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Definitions of calorimeter

calorimeter (n.)
a measuring instrument that determines quantities of heat;
From wordnet.princeton.edu