fish tank

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Also see: tank

Concise Oxford English Dictionary © 2008 Oxford University Press:
fish1

▶noun (pl. same or fishes)

• 1 a limbless cold-blooded vertebrate animal with gills and fins, living wholly in water.

  ■ the flesh of fish as food.

• 2 used in names of invertebrate animals living wholly in water, e.g. shellfish, jellyfish.

• 3 informal a person who is strange in a specified way: he's a cold fish.

▶verb

• 1 catch fish with a net or hook and line.

  ■ fish in (a body of water).

• 2 (fish something out) pull or take something out of water or a receptacle.

• 3 grope or feel for something concealed.

• 4 try subtly to obtain a response or information: I was not fishing for compliments.

– phrases
big fish an important person.
a big fish in a small pond a person who is important only within a limited sphere.
a fish out of water a person who feels out of place in their surroundings.
have other (or bigger) fish to fry have more important matters to attend to.

– derivatives
fishable adjective,
fishing noun.

– origin OE fisc (as a noun denoting any animal living exclusively in water), fiscian (v.), of Gmc origin.

usage: The normal plural of fish is fish (a shoal of fish; he caught two huge fish). The older form fishes is still used when referring to different kinds of fish (freshwater fishes of the British Isles).

Concise Oxford English Dictionary © 2008 Oxford University Press:
fish2

▶noun

• 1 a flat plate fixed on a beam or across a joint to give additional strength.

• 2 a long curved piece of wood lashed to a ship's damaged mast or spar as a temporary repair.

▶verb

• 1 strengthen or mend with a fish.

• 2 join (rails) with a fishplate.

– origin C16: prob. from Fr. fiche, from ficher ‘to fix’, based on L. figere.