Definition of water flea
:any of various small active dark or brightly colored aquatic crustaceans (such as a daphnia or cyclops)
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water flea
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First Known Use of water flea
1687
WATER FLEA Defined for Kids
water flea
noun
Definition of water flea for Students
:a tiny often brightly colored freshwater animal related to the crab and lobster
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Britannica.com: Encyclopedia article about water flea
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