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Definition of Term

(English) A shiny hard material covering the dentine of teeth and the surface of some scales (cosmoid and placoid scales). This is the hardest substance produced by vertebrates. Of ectodermal origin, produced by ameloblasts. Consisting of crystals of a calcium phosphate-carbonate salt (apatite) cemented in an organic matrix. (See also: dentine, placoid scale, vertebrates)

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