any voracious marine fish of the genus Sphyraena having an elongated cylindrical body and large mouth with projecting lower jaw and long strong teeth
"The divers quickly retreated when they spotted a barracuda lurking near the coral reef."
Any large marine fish of the genus Sphyraena that have elongated bodies, a projecting lower jaw, displaying prominent fang-shaped teeth, and are aggressive predators.
"The seasoned angler knew better than to approach the reef too closely after spotting a barracuda lurking beneath the surface with its sharp teeth bared."