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Entry 2 senses · 2 variants Webster, 1913

Placoid

/plăk'-oid/ · Plac·oid · IPA /plˈækɔɪd/
01 a. Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
  1. 1.
    Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.(Zool.)
02 n. Any fish having placoid scales, as the sharks.
  1. 1.
    Any fish having placoid scales, as the sharks.(Zool.)