ther·mo·reg·u·la·tion 
(thûr′mō-rĕg′yə-lāshən)
(thûr′mō-rĕg′yə-lāshən)n.
Maintenance of a constant internal body temperature independent from the environmental temperature: mammalian thermoregulation.
ther′mo·regu·la·to′ry (-rĕgyə-lə-tôr′ē) adj.