From Longman Dictionary of Contemporary Englishbay windowˌbay ˈwindow noun [countable] DHTBBa window that sticks out from the wall of a house, usually with glass on three sides
Examples from the Corpus
bay window• They had a drink before dinner sitting in a bay window, watching dusk creep up on Dunkery Beacon.• A bay window, book case, cupboard and a settee were damaged in the fire.• A special feature is a cantilevered bay window which is designed to create more space and to give plenty of natural light.• She came round the side of the house and looked in at the bay window.• A gilt harp sits in the bay window of the sitting room.Origin bay window (1400-1500) → BAY13 