1.Definition: a fine coating of oxide (produced by oxidation over a long period of time) on the surface of a metal (particularly copper)

Category: Objects

2.Definition: a gloss or sheen on wooden furniture produced by age, polishing, or handling

Category: Objects

3.Definition: an acquired change in the appearance of something (other than metal or wood)

"A patina of frost", "A patina of good breeding"

Category: Objects