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

plural of bay window

A bay off the west coast of Ireland, between the counties of Galway and Connacht.

a gulf of the North Atlantic Ocean along the western coast of France from Brest south to the Spanish border, and the northern coast of Spain, named for the Spanish province of Biscay

A city, the parish capital of Saint James Parish, Jamaica.

A large bay of Thunder Bay district, Northwestern Ontario, Northern Ontario, Ontario, Canada, on Lake Superior, Great Lakes, North America.

(informal, dated) San Francisco (a city in California)

plural of Bay fever

(in Canada) A street in Toronto where many banks and other financial institutions are based. / (Canada, by extension) Financial interests in Canada, especially in Toronto.

A sea between Greenland and Nunavut.