Definitions for placoidˈplæk ɔɪd
Random House Webster's College Dictionary
platelike, as the scales or dermal investments of sharks.
Origin of placoid:
1835–45; < Gk plak- (s. of pláx) something flat, tablet
as the hard flattened scales of e.g. sharks
Any fish having placoid scales, such as the sharks.
platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids
any fish having placoid scales, as the sharks
one of the Placoides