Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
jackknife-fish is a noun meaning "black-and-white drumfish with an erect elongated dorsal fin". It carries one recorded sense.
black-and-white drumfish with an erect elongated dorsal fin
Definitions, synonyms and semantic relations for jackknife-fish come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.