placoid

adjective
plac·​oid | \ˈpla-ˌkȯid \

Definition of placoid 

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

First Known Use of placoid

1842, in the meaning defined above

History and Etymology for placoid

Greek plak-, plax flat surface

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The first known use of placoid was in 1842

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