Source : Webster's Revised Unabridged Dictionary (1913)

Ganoine \Ga"no*ine\, n. (Zo["o]l.)
   A peculiar bony tissue beneath the enamel of a ganoid scale.

Source : WordNet®

ganoine
     n : shiny substance that resemble enamel and is secreted by the
         corium of certain fishes (especially ganoid fishes) and
         composes the outer layer of their scales [syn: {ganoin}]