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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Os·trac·o·da prop. n. pl. Zool. An order of Entomostraca possessing shrimplike bodies enclosed in hard bivalve shells; called also seed shrimp and mussel shrimp.  They were formerly referred to as Ostracoidea.  They are of small size, and swim freely about;  many are less than 1 mm in length.  Microfossils of certain extinct orders have been found extending back to the Cambrian age.
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From: WordNet (r) 2.0

 seed shrimp
      n : tiny marine and freshwater crustaceans with a shrimp-like
          body enclosed in a bivalve shell [syn: mussel shrimp, ostracod]