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From The Collaborative International Dictionary of English v.0.48:
Ganoid \Ga"noid\, a. [Gr. ? brightness + -oid.] (Zool.) Of or pertaining to Ganoidei. -- n. One of the Ganoidei. [1913 Webster] 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]