on.lay

n.（名詞）
Something laid or applied over something else, as to add relief to a surface.
裝飾用貼面：貼在某物表面上的材料,用來突出該物體表面特征
Medicine A graft applied to the surface of the recipient organ or structure.
【醫(yī)學】 覆蓋物：醫(yī)學上附加在器官或組織表面的一層皮膏
Dentistry A cast, usually made of gold, attached to the occlusal surface of a tooth.
【牙科學】 填補物：牙科學中所用的一種石膏，通常是金子制的，用來填牙齒損壞的部分