DictionaryfishAquatic animal
noun / verb

fish

FISH/fɪʃ/

An aquatic animal with gills and usually fins.

A silver fish swims beneath the clear surface of the pond.

One living perch swimming in side profile, with a recognizable gill cover, overlapping scales, and clearly separated fins.
Etymology

Old English fisc could name aquatic animals generally, not just the gilled, finned vertebrates meant here. That broader usage survives in compounds such as shellfish and starfish.

In context

SciShow2:18
a fish with an infection usually ends up with 1 female in its mouth and as many as 5 males in its gills!
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More examples

  • We fished from the old pier.
  • The lake contains several kinds of fish.
  • She photographed colorful fishes on the reef.

Forms

fish · fishes · fished · fishing · fishs

fisher noun — Someone who catches fish