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The Collaborative International Dictionary of English v.0.48 (gcide)

Ostracoda \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.
[1913 Webster PJC]


Ostracoidea \Os`tra*coi"de*a\, n. pl. [NL., fr. Gr. 'o`strakon
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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