(originally) A paten, flat type of dish.

The colour or incrustation which age and wear give to (mainly metallic) objects; especially, the green rust which covers works of art such as ancient bronzes, coins and medals.

(color) A green colour, tinted with grey, like that of bronze patina.

(figurative) A gloss or superficial layer.

Of a green colour, tinted with grey, like that of bronze patina.