The Collaborative International Dictionary
Thermoneutrality
Thermoneutrality \Ther`mo*neu*tral"i*ty\, n. (Chem.) Neutrality as regards heat effects.
Wiktionary
thermoneutrality
n. 1 (context biology English) The state of being neutral with regard to heat effects; the state of being thermoneutral 2 (context biology English) The heat-neutral temperature for a given animal: the temperature at which it does not need to regulate its body temperature