A projecting shop window, usually with curved sides, common in the 19th century.

A person who window-shops.

present participle of window-shop

(idiomatic) The browsing of shop windows without any intention of buying.

plural of window sill

dormer-window

plural of transom window

(US) A window cleaner; a person who cleans windows for a living.

rose window

(freestyle skiing slang) windmill-like flailing of one's arms in a circular motion to maintain balance while in the air after a jump