placoid

placoid

美 ['plækɔɪd] 　英 ['plækɔɪd]

• adj.【动】板状的；有盾状鳞的
• n.有盾鳞的鱼
• 网络盾鳞状的

英汉解释

adj.	1. 【动】板状的;有盾状鳞的
n.	1. 有盾鳞的鱼

英英解释

adj.	1. describes fish scales that have a flat base and a sharp projecting spine tipped with enamel. The subclass of fish that includes sharks, rays, and skates have placoid scales.

例句

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

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

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）中层的坚硬物质。