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Definitions of placoid
  1. adjective
    as the hard flattened scales of e.g. sharks
Definition that contains placoid
  • elasmobranch any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates
  • selachian any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates
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