Source : Webster's Revised Unabridged Dictionary (1913)

Ostracoda \Os*trac"o*da\, n. pl. (Zo["o]l.)
   Ostracoidea.

Ostracoidea \Os`tra*coi"de*a\, n. pl. [NL., fr. Gr. ? shell of a
   testacean + -oid.] (Zo["o]l.)
   An order of Entomostraca possessing hard bivalve shells. They
   are of small size, and swim freely about. [Written also
   {Ostracoda}.]

Source : WordNet®

Ostracoda
     n : seed shrimps [syn: {subclass Ostracoda}]