Alcove

Webster's Dictionary of the English Language

·noun Any natural recess analogous to an alcove or recess in an Apartment.

II. Alcove ·noun A small ornamental building with seats, or an arched seat, in a pleasure ground; a garden bower.

III. Alcove ·noun A recessed portion of a room, or a small room opening into a larger one; especially, a recess to contain a bed; a lateral recess in a library.