daphnia

n., pl., daphnia.
Any of various water fleas of the genus Daphnia, some species of which are commonly used as food for aquarium fish.

[New Latin Daphnia, genus name, from Greek Daphnē, Daphne.]

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The noun has one meaning:

Meaning #1: minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae
  Synonym: water flea

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