[daf-nee-uh] 
| a genus of tiny, freshwater crustaceans having a transparent body, used in biological research and as food for tropical fish. |
| daph·ni·a (dāf'nē-ə) n. pl. daphnia Any of various water fleas of the genus Daphnia, some species of which are commonly used as food for aquarium fish. [New Latin Daphnia, genus name, from Greek Daphnē, Daphne.] |
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