adjective \ˈpla-ˌkid\

Definition of PLACOID

:  of, relating to, or being a scale of dermal origin with an enamel-tipped spine characteristic of the elasmobranchs

Origin of PLACOID

Greek plak-, plax flat surface
First Known Use: 1842


Next Word in the Dictionary: placoidal
Previous Word in the Dictionary: Placoganoidei
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