bay window

WordReference Random House Learner's Dictionary of American English © 2026

ˈbay ˈwin•dow, n. [countable]

1. Building, Architecture a large window sticking out from an outside wall and forming an alcove of a room.

WordReference Random House Unabridged Dictionary of American English © 2026

bay′ win′dow, 

1. Building, Architecture an alcove of a room, projecting from an outside wall and having its own windows, esp. one having its own foundations. Cf. bow window, oriel.
2. Informal Terms a large, protruding belly;
   paunch.
• late Middle English 1400–50

Collins Concise English Dictionary © HarperCollins Publishers::

bay window noun

1. a window projecting from the wall of a building and forming an alcove of a room
   See also bow window, oriel window