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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
heterothermic is an adjective meaning "of animals except birds and mammals; having body temperature that varies with the environment". It carries one recorded sense.
of animals except birds and mammals; having body temperature that varies with the environment
Definitions, synonyms and semantic relations for heterothermic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.