Ganoid \Ga"noid\, a. [Gr. ? brightness + -oid.] (Zool.)
   Of or pertaining to Ganoidei. -- n. One of the Ganoidei.
   
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   {Ganoid scale} (Zool.), one kind of scales of the ganoid
      fishes, composed of an inner layer of bone, and an outer
      layer of shining enamel. They are often so arranged as to
      form a coat of mail.
      
[1913 Webster]