Noun: poikilotherm poy'ki-lu,thurm or 'poy-ku-low,thurm
- An animal whose body temperature varies with the temperature of its surroundings
"Reptiles are poikilotherms that bask in the sun to warm up";
- ectotherm
Derived forms: poikilotherms
Type of: animal, animate being
Encyclopedia: Poikilotherm