A thin scale,plate,or layer of bone or tissue,as in the gills of a bivalve mollusk or around the minute vascular canals in bone.

• 薄片，薄板，薄层一种薄的骨头或组织的鳞片、盘、或壳层，如双壳软体动物组成鳃的薄板或是骨内环绕小的维管的骨层或组织。