old master

(picture painted by an) important painter of the past (esp the 13th-17th centuries in Europe) 大画家, 大画家的画（尤指13-17世纪欧洲的）.

okay, okay (also OK), okey, okra, old, old age, old boy, old boy (fem 阴性作 `old girl), Old English, old fogey (US old fogy), old folk, old folks' home, old girl, Old Glory, Old Harry (also Old Nick, Old Scratch), old lady, old lag, old maid, old man, old man's beard, old school, old stager, old sweat, old woman, old-fashioned, old-maidish, old-time, old-timer, old-world, olden, oldie, oldish, oldster, oleaginous, oleander, olfaction, olfactory, oligarch, oligarchy, olive,