Webster's English Dictionary

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patina

pa.ti.na \'pat-*-n*, p*-'te--n*\ \-n*z\ \'pat-*-.ne-, -.ni-\ n or pa.ti.nas 
   or pa.ti.nae [NL, fr. L, shallow dish - more at PATEN] pl  1a: a usu. green 
   film formed naturally on copper and bronze by long exposur e or 
   artificially (as by acids) and often valued aesthetically for its color 1b: 
   a surface appearance of something grown beautiful esp. with age or use  1c: 
   an appearance or aura that is derived from association, habit, or estab 
   lished character 2: PATEN