ectotherm ectotheca • ectothermic · · · Info · Definitions · Synonyms · Characters · · ectotherm · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals. Synonyms: poikilotherm. · · Noun Definition 1 Synonyms · · · poikilotherm · · Synonym 1 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074