Water-flea definitions

Any of various small chiefly freshwater branchiopod crustaceans of the order Cladocera, having a bivalve carapace and typically swimming with jerking flealike motions, and including the daphnias.
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Any of various other small aquatic crustaceans, such as some copepods, that swim with a similar motion.
noun
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Any of an order (Cladocera) of mostly freshwater branchiopods; esp., any of a genus (Daphnia) commonly found in ponds and used to feed fish in aquariums.
noun
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Any of various aquatic crustacea of the order Cladocera, characterised by their jumping or jerky mode of swimming.
noun
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