placoid definition

  • adjective:
    • Platelike, while the difficult toothlike scales of sharks, skates, and rays.
    • platelike; having irregular, platelike, bony scales, frequently bearing spines; with respect to the placoids.
    • Platelike; having unusual, platelike, bony scales, frequently bearing spines; regarding the placoids.
    • once the hard flattened machines of e.g. sharks
  • noun:
    • Any seafood having placoid scales, including the sharks.
    • Any fish having placoid machines, as sharks.
    • the Placoides.
    • a part of Placoidei.
  • others:
    • Plate-like: noting the dermal assets of sharks, which substitute for true machines and are the ossified papillæ of cutis.
    • Having placoid machines, as a fish; from the Placoidei. See cut-under scale

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