1. （物体表面形成的）薄层
A patina is a thin layer of something that has formed on the surface of something.

2. （旧东西年深日久产生的）包浆，光泽
The patina on an old object is an attractive soft shine that has developed on its surface, usually because it has been used a lot.

3. （有点儿…的）样子
If you say that someone has a patina of a quality or characteristic, you mean that they have a small but impressive amount of this quality or characteristic.

1. a fine coating of oxide on the surface of a metal