Synonym for poikilotherm ... <biology, zoology> An organism, such as a fish or reptile, that is cold-blooded, i.e., one whose internal body temperature varies with that of the environment. ... (09 Oct 1997) ... 
(al´o-thәrm″) an organism whose body temperature changes with its environment.
Type: Term Pronunciation: al′ō-therm Synonyms: poikilotherm
allotherm An organism having a body temperature determined largely by the ambient or surrounding temperature.