(sciences) Variegated or variable.

(biology, of a plant) Having no mechanism to prevent desiccation

(medicine) The inability to regulate one's body temperature.

(rare) The formation of cells, having variably shaped nuclei, that occurs in Bowen's disease.

cold-blooded

A cold-blooded animal

plural of poikilotherm

(geology) Describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral

(of an animal) Having a body temperature that varies depending on the outside temperature.

(biology) The quality of having a body temperature that varies or fluctuates, depending on the temperature of the environment; cold-bloodedness.