Pronunciation: (pat'n-u, pu-tē'nu),[key]Pronunciation: (pu-tēn'),[key] —n. 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, usu. indicating great age. Also,patine.