patina

[pat-n-uh, puh-tee-nuh]
noun
1.
a film or incrustation, usually green, produced by oxidation on the surface of old bronze and often esteemed as being of ornamental value.
2.
a similar film or coloring appearing gradually on some other substance.
3.
a surface calcification of implements, usually indicating great age.
Also, patine, [puh-teen]


Origin:
1740–50; < Italian: coating < Latin: pan. See paten

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World English Dictionary
patina1 (ˈpætɪnə)
 
n , pl -nas
1.  See also verdigris a film of oxide formed on the surface of a metal, esp the green oxidation of bronze or copper
2.  any fine layer on a surface: a patina of frost
3.  the sheen on a surface that is caused by much handling
 
[C18: from Italian: coating, from Latin: patina²]

patina2 (ˈpætɪnə)
 
n , pl -nae
a broad shallow dish used in ancient Rome
 
[from Latin, from Greek patanē platter]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

patina
"greenish film on old bronze," 1748, from Fr. patine (18c.), from It. patina, perhaps from L. patina "dish, pan," on the notion of encrustation on ancient bronze dishes. Sense of "refinement, cultural sophistication" first recorded 1933.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Typically, those who are running for high office tinge their lengthy
  discussions of policy with a patina of piety.
But if you visit quickly, you'll catch a world with an endangered patina.
The top notches into legs made of multicolored concrete that has a patina.
Finally, a modern music player that can grow a patina.
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