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ganoid(of fish) possessing ganoid scales, typified by a hard shiny layer of ganoine (an enamel-like substance) and the fact that they increase in thickness by adding layers all round, ganoine above, laminated from below. Compare COSMOID, PLACOID.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005