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From The Collaborative International Dictionary of English v.0.48:
Bay window \Bay" win"dow\ 1. (Arch.) A window forming a bay or recess in a room, and projecting outward from the wall, either in a rectangular, polygonal, or semicircular form; -- often corruptly called a bow window. Syn: bay window, bow window, bow-window. [1913 Webster + WordNet 1.5] 2. a protruding abdomen. [informal] Syn: belly, paunch, pot, potbelly, corporation, tummy. [WordNet 1.5]