placoid Hear it!

placoid definition

plac·oid (plak′o̵id′)

adjective

Zool. of or having scales that are periodically shed and replaced, consisting of a dentin base and an enamel-covered surface, as in cartilaginous fishes

Etymology: < Gr plax, flat plate, tablet (see placenta) + -oid

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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