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ganoin

or gan·o·ine

[gan-oh-in]
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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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Origin of ganoin

First recorded in 1855–60; gano(id) + -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018