ganoin

American  

[gan-oh-in] / ˈgæn oʊ ɪn /

Or ganoine

noun

Ichthyology.

1. a hard, shiny, enamellike substance secreted by the corium, composing the outer layer of the scales of certain fishes.

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Etymology

Origin of ganoin

First recorded in 1855–60; gano(id) + -in ²