bay window

noun

1. an alcove of a room, projecting from an outside wall and having its own windows, especially one having its own foundations.

2. Informal.,  a large, protruding belly; paunch.

bay window

noun

1. Sometimes shortened to: bay. a window projecting from the wall of a building and forming an alcove of a room See also bow window oriel window

Word History and Origins

Origin of bay window¹

late Middle English word dating back to 1400–50