Placoid(a.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
Placoid(n.) Any fish having placoid scales, as the sharks.
Placoid(n.) One of the Placoides.
Placoides(n. pl.) A group of fishes including the sharks and rays; the Elasmobranchii; -- called also Placoidei.

Words within placoids