bay window

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Architecture A large window or series of windows projecting from the outer wall of a building and forming a recess within.
• noun Slang A protruding belly; a paunch.

from The Century Dictionary.

• noun In architecture, properly, a window forming a recess or bay in a room, projecting outward, and rising from the ground or basement on a plan rectangular, semi-octagonal, or semi-hexagonal, but always straight-sided.

from the GNU version of the Collaborative International Dictionary of English.

• (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.
• informal a protruding abdomen.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun architecture A window space projecting outward from the main walls of a building and forming a bay in a room.
• noun figuratively A protruding belly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a window that sticks out from the outside wall of a house
• noun slang for a paunch