From WordNet (r) 2.0 (August 2003) [wn]:
ganoid
n : primitive fishes having thick bony scales with a shiny
covering [syn: ganoid fish]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]