sablefish Syllabification: (sa·ble·fish)Pronunciation: /ˈsābəlˌfiSH/Definition of sablefish noun (plural same or sablefishes) a large commercially important fish with a slate-blue to black back, occurring throughout the North Pacific. Anoplopoma fimbria, family Anoplopomatidae sablefish in other Oxford dictionaries Definition of sablefish in the British & World English dictionary