water flea


noun

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

Origin of water flea

First recorded in 1575–85

Example sentences from the Web for water flea

British Dictionary definitions for water flea

water flea

noun

any of numerous minute freshwater branchiopod crustaceans of the order Cladocera, which swim by means of hairy branched antennae See also daphnia