ganoid

[gan-oid]
adjective
1.
of or pertaining to the Ganoidei, a group of mostly extinct fishes characterized by hard, bony scales, the living species of which include the paddlefishes, sturgeons, and gars.
2.
(of the scale of a fish) having a smooth, shiny surface of ganoin or a similar substance.
noun
3.
a ganoid fish.

Origin:
1830–40; < French ganoïde < Greek gán(os) brightness + -oïde -oid

subganoid, adjective
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World English Dictionary
ganoid (ˈɡænɔɪd)
 
adj
1.  (of the scales of certain fishes) consisting of an inner bony layer and an outer layer of an enamel-like substance (ganoin)
2.  denoting fishes, including the sturgeon and bowfin, having such scales
 
n
3.  a ganoid fish
 
[C19: from French ganoïde, from Greek ganos brightness + -oid]

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Example sentences
There is nothing left alive and progressive but a ganoid or two and perhaps half a dozen asteroids.
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