a green or brown film or layer that forms on the surface of metals like copper and bronze as a result of exposure and reaction to air and/or chemicals over a period of time;
e.g. Over the years, the bronze statue had acquired a green patina.
(noun)
a glossy finish on a surface due to polishing or age or wear;
e.g. The wooden surface will acquire a patina with age due to repeated polishing.
(noun)
an aura or appearance of a particular quality;
e.g. She carries the patina of honesty and good morals.