OSTRACODERMI
Os`tra*coder"mi, n. pl. Etym: [NL., fr. Gr. (Zoöl.)
Defn: A suborder of fishes of which Ostracion is the type.
OSTRACOID
Os"tra*coid, a. (Zoöl.)
Defn: Of or pertaining to the Ostracoidea.
— n.
Defn: One of the Ostracoidea.
OSTRACOIDEA
Os`tra*coi"de*a, n. pl. Etym: [NL., fr. Gr. -oid.] (Zoöl.)
Defn: An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about. [Written also Ostracoda.]
OSTREA
Os"tre*a, n. Etym: [L., an oyster.] (Zoöl.)
Defn: A genus of bivalve Mollusca which includes the true oysters.
OSTREACEOUS
Os`tre*a"ceous, a. Etym: [L. ostrea an oyster. See Oyster.] (Zoöl.)