transom

English Thesaurus

1. a horizontal crosspiece across a window or separating a door from a window over it (noun.artifact)

hypernym	:	crosspiece,
definition	:	a transverse brace (noun.artifact)

2. a window above a door that is usually hinged to a horizontal crosspiece over the door (noun.artifact)

hypernym	:	window,
definition	:	a framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air (noun.artifact)