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Plā'coid or Pla-coid'i-an, a.

adjective

a. Pertaining to the placoids.

Also printed under this word

Pla-coid'i-an, n.p. 993noun(Palæon.) One of an order of fishes, having the skin covered with irregularly enameled plates or points, as the shark, ray, and the like. Agassiz.