spearfishPronunciation: /ˈspɪəfɪʃ/Definition of spearfish noun (plural same or spearfishes) a billfish that resembles the marlin. Genus Tetrapturus, family Istiophoridae: several species verb [no object] (often as noun spearfishing) fish using a spear: spearfishing is strictly illegal in the marine parks resort owners do not allow tourists to spearfishspearfish in other Oxford dictionaries Definition of spearfish in the US English dictionary