pa·ti·na

/pəˈtiːnə/ noun, pl -nas [count]

1 : a thin usually green layer that forms naturally on the metals copper and bronze when they are exposed to the air for a long time

2 : a shiny or dark surface that forms naturally on something (such as wood or leather) that is used for a long time

— usually singular

the beautiful patina of this antique table

3 : a thin layer

— usually singular

The kitchen counter was covered with a patina of grease.

— often used figuratively

a criminal who has been given a patina of respectability by his friendship with well-known businessmen