• (a.) Relating to heat, or to the production of heat; producing heat; thermogenous; as, the thermogenic tissues.
Ther`mo·gen'ic adjective (Physiol.) Relating to heat, or to the production of heat; producing heat; thermogenous; as, the thermogenic tissues. 
thermogenesis, thermogenic, thermogenetic 1. The production of heat; specifically, the physiological process of heat production in the body; especially, of an animal body. 2. A process of heat production in an organism by means of various physiological processes.