devilfish Syllabification: (dev·il·fish)Pronunciation: /ˈdevəlˌfiSH/Definition of devilfish noun (plural same or devilfishes) any of a number of marine creatures that are perceived as having a sinister appearance, in particular a devil ray, a stonefish, or an octopus or squid. devilfish in other Oxford dictionaries Definition of devilfish in the British & World English dictionary