| poikilotherm | (n) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals, Syn. ectotherm |
| poikilothermic | (adj) of animals except birds and mammals; having body temperature that varies with the environment, Syn. poikilothermous, ectothermic, heterothermic |
| Poikilothermic | |
| Poikilothermous | a. (Physiol.) Poikilothermal. [ 1913 Webster ] |