内ない温おん動どう物ぶつ

Meanings

1

noun

endotherm

Technical term in biology for an animal that generates its own body heat internally, as opposed to ectotherms.

thing, object, matter

外がい温おん動どう物ぶつ
外温動物 (ectotherm) is the opposite: an animal that relies on external heat sources to regulate body temperature.
恒こう温おん動どう物ぶつ
恒温動物 (homeotherm) emphasizes maintaining a constant body temperature, while 内温動物 focuses on the internal heat production mechanism.

Compound of 内 (nai, 'inside') + 温 (on, 'warm') + 動物 (dōbutsu, 'animal'), literally 'internal-heat animal'. A modern scientific coinage.