poi·ki·lo·therm / poy.key.la.therm
noun – a cold-blooded animal that regulates its body temperature by its environment
related forms of poikilotherm: poikilothermic (adjective)
poikilotherm in a sentence: A poikilotherm can’t regulate its own temperature, it needs to bask in the sun or hide in the shade
examples of poikilotherms in nature: cold-blooded animals such as snakes, lizards, and frogs
see also: thermoregulation, homeotherm, cold-blooded, warm-blooded