UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈplækɔɪd/US:USA pronunciation: respellingUSA pronunciation: respelling(plakoid)

WordReference Random House Unabridged Dictionary of American English © 2020
plac•oid  (plakoid),USA pronunciation adj. 
  1. Zoologyplatelike, as the scales or dermal investments of sharks.
  • Greek plak- (stem of pláx) something flat, tablet + -oid
  • 1835–45

Collins Concise English Dictionary © HarperCollins Publishers::
placoid /ˈplækɔɪd/ adj
  1. platelike or flattened
  2. (of the scales of sharks and other elasmobranchs) toothlike; composed of dentine with an enamel tip and basal pulp cavity
Etymology: 19th Century: from Greek plac-, plax flat
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