water-flea

water flea

noun
any of various small crustaceans that move about in the water like fleas, as those of the genus Daphnia.

Origin:
1575–85

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World English Dictionary
water flea
 
n
See also daphnia any of numerous minute freshwater branchiopod crustaceans of the order Cladocera, which swim by means of hairy branched antennae

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