plac·oid /ˈplæˌkɔɪd/
  (a.)盾鱗狀的有盾鱗的魚
  Plac·oid a.  Zool. Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
  Plac·oid, n. Zool. (a) Any fish having placoid scales, as the sharks. (b) One of the Placoides.
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  placoid
       adj : as the hard flattened scales of e.g. sharks [syn: platelike]