calorimeter
ca·lo·ri·meter
noun
1.
a measuring instrument that determines quantities of heat
Origin
From Latin calor (“warmth, heat”) + -meter.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.