Definition of knifefish in English:

knifefish

nounPlural knifefishes

  • A semi-nocturnal freshwater fish with a reduced or absent dorsal fin and a long anal fin which reaches from the belly to the tail.

    another term for featherback

    a New World fish with a narrow eel-like body (families Rhamphichthyidae and Gymnotidae: several genera).

    • ‘Among these clades are such diverse forms as arawanas, knifefishes, mormyrids, eels, tarpon, and herring.’
    • ‘Turbid habitats are home to many fishes that utilize electroreception to find prey, and some predators (e.g. knifefishes and the electric eel) use intense electrical shocks of as much as 350 volts to stun prey before consuming them.’

Pronunciation

knifefish

/ˈnaɪf(f)ɪʃ/