Bay window (&unr_;). 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]