GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       
‖Ostracoda (?), 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.

    [1913 Webster +PJC]

    
      
    
  2.       
‖Ostracoidea (?), n. pl. [NL., fr. Gr. ὄστρακον shell of a testacean + -oid.] (Zool.) An order of Entomostraca possessing hard bivalve shells.  They are of small size, and swim freely about.  Now usually written Ostracoda. [archaic]

    [1913 Webster +PJC]

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