| Noun | 1. | genus Prionace - blue sharks fish genus - any of various genus of fish Carcharhinidae, family Carcharhinidae - largest family of living sharks; found worldwide especially in tropical waters; dorsal fin lacks spines: requiem sharks including tiger sharks and soupfin sharks blue shark, great blue shark, Prionace glauca - slender cosmopolitan, pelagic shark; blue body shades to white belly; dangerous especially during maritime disasters |