patina

1 ENTRIES FOUND:
patina /pəˈtiːnə/ noun
plural patinas
patina
/pəˈtiːnə/
noun
plural patinas
Britannica Dictionary definition of PATINA
[count]
1 
: a thin usually green layer that forms naturally on the metals copper and bronze when they are exposed to the air for a long time
2 
: a shiny or dark surface that forms naturally on something (such as wood or leather) that is used for a long time — usually singular
3 
: a thin layer — usually singular
— often used figuratively