The angled part of a staircase used for handholding. Usually on both sides of the staircase, sometimes it is put only on one side.

(chiefly Britain, rare or dated) A flight of stairs

Alternative spelling of backstairs

An impossible loop of endlessly ascending and descending stairs, or an optical illusion appearing to depict such a loop.

(archaic) Upstairs; in or on an upper floor.

(archaic) The part of a building above the ground level.

stairs leading to a trapdoor

plural of stair hall

The stairs, landings, hallways, or other portions of the public hall through which it is necessary to pass when going from the entrance floor to the other floors of a building.

A fire escape.