恒こう温おん動どう物ぶつこうおんどうぶつMeanings1nounhomeotherm; warm-blooded animalBiological term for animals that maintain a constant body temperature, such as mammals and birds. Often contrasted with 変温動物 (poikilotherm).See also: 変温動物 · 温血動物哺ほ乳にゅう類るいと鳥ちょう類るいは恒こう温