Plā'coid or Pla-coid'i-an1, a.
a. Pertaining to the placoids.
2 entries under this word
Placoid
Pla-coid'i-an2, n.
n. [Gr. πλάξ, πλακός, any thing flat and broad, and εἶδος, form; Ger. placoïen.] (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.