a green, black or brown layer that forms on the surface of some metals （金属表面的）绿锈，铜锈，氧化层 The bronze statue had acquired a hard green patina with age. 随着时间的推移，这尊铜像已经染上了坚硬的绿色铜锈。
a thin layer that forms on other materials; the shiny surface that develops on wood or leather when it is polished 薄层；（木器或皮革的）光泽
Word Originmid 18th cent.: from Italian, from Latin patina ‘shallow dish’.