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