Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
opisthognathous is an adjective meaning "having receding jaws". It carries one recorded sense.
having receding jaws
Definitions, synonyms and semantic relations for opisthognathous come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.