Water Flea Definition

noun
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.
Webster's New World
Any of various other small aquatic crustaceans, such as some copepods, that swim with a similar motion.
American Heritage
Synonyms:

Other Word Forms of Water Flea

Noun

Singular:
water flea
Plural:
water-fleas

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water flea