/pat"n euh, peuh tee"neuh/ , /peuh teen"/ , 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 .
[ 1740-50; ]