| poikilotherm | (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals | Synonyms: ectotherm |
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| poikilothermic | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, heterothermic, poikilothermous |
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| poikilothermous | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, heterothermic, poikilothermic |
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