patina - Dictionary definition and pronunciation - Yahoo! Education
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pat·i·na2  audio  (ptn-, p-tn) KEY  also pa·tine  (p-tn) KEY 

NOUN:
  1. A thin greenish layer, usually basic copper sulfate, that forms on copper or copper alloys, such as bronze, as a result of corrosion.
  2. The sheen on any surface, produced by age and use.
  3. A change in appearance produced by long-standing behavior, practice, or use: a face etched with a patina of fine lines and tiny wrinkles.
ETYMOLOGY:
Italian, from Latin, plate (from the incrustation on ancient metal plates and dishes) ; see paten


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