designating, of, or produced by a chemical change in which there is an absorption of heat
See endothermic in American Heritage Dictionary 4
(ĕnˌdō-thûrˈmĭk) also en·do·ther·mal(-məl)
adjective
Chemistry Characterized by or causing the absorption of heat; endoergic.
Biology Of or relating to an organism that generates heat to maintain its body temperature, typically above the temperature of its surroundings; warm-blooded.