PLACOGANOIDEI
Plac`o*ga*noi"de*i, n. pl. Etym: [NL., fr. Gr. ganoidei. See
Ganoidei.] (Zoöl.)
Defn: A division of ganoid fishes including those that have large external bony plates and a cartilaginous skeleton.
PLACOID
Plac"oid, a. Etym: [Gr. -oid.] (Zoöl.)
Defn: Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
PLACOID Plac"oid, n. (Zoöl.) (a) Any fish having placoid scales, as the sharks. (b) One of the Placoides.
PLACOIDES
Pla*coi"des, n. pl. Etym: [NL.] (Zoöl.)
Defn: A group of fishes including the sharks and rays; the
Elasmobranchii; — called also Placoidei.
PLACOIDIAN
Pla*coid"i*an, n. (Zoöl.)
Defn: One of the placoids.
PLACOPHORA
Pla*coph"o*ra, n. pl. Etym: [NL., from Gr. (Zoöl.)