cosmoid

dentine A hard mesodermal material in teeth and some scales (cosmoid, ganoid and placoid scales) produced by odontobasts.

齿质组成牙齿或某些鳞片(硬鳞与盾鳞)中层的坚硬质。

enamel A shiny hard material covering the dentine of teeth and the surface of some scales (cosmoid and placoid scales).

珐琅有光泽的坚硬质包覆在牙齿及一些鳞片(圆鳞与盾鳞)表面。这是脊椎动所产生最坚硬的质。