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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Spice up your mating life with these relationship tips from sharks, lizards and water fleas.
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First Known Use of water flea
1687
WATER FLEA Defined for Kids
water flea
Definition of water flea for Students
: a tiny often brightly colored freshwater animal related to the crab and lobster
Learn More about water flea
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Britannica.com: Encyclopedia article about water flea
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