noun
great barracuda
A large predatory fish, Sphyraena barracuda, known in Japanese as オニカマス. The name literally means 'demon barracuda'.
オニカマスは大きな歯を持つ危険な魚です。
The great barracuda is a dangerous fish with large teeth.
From 鬼 (oni, 'demon') + 魣 (kamasu, 'barracuda'), referring to its fierce appearance and size.