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endothermic (adj.)

1869, originally in chemistry, "causing, relating to, or requiring the absorption of heat," from French endothermique (1868, Berthelot); see endo- + thermal. By 1947 in biology, "dependent on or capable of the internal generation of heat; warm-blooded."

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Definitions of endothermic from WordNet

endothermic (adj.)
(of a chemical reaction or compound) occurring or formed with absorption of heat;
Synonyms: endothermal / heat-absorbing
From wordnet.princeton.edu