A rail providing a handhold and serving as a support at the side of a stair or platform

The measured height of a stair step or a flight of steps

The horizontal distance between successive risers or between the first and last risers of a flight of steps

The top or top landing of a stairway

A structure of wood, metal, or rope, usually consisting of two sidepieces joined at suitable intervals by bars or rungs, forming a means of climbing up or down at an angle of pitch between 75° and 90°

One of the crosspieces, usually rounded, forming the steps of a ladder

A fixed stepladder having an angle of pitch between 55° and 70°, usually equipped with handrails

A vertical shaft or opening containing a stairway

A support for the foot in ascending or descending

One of a flight or series of steps for going from one level to another, as in a building

A passageway from one level of a building to another by a flight of stairs

The usually rounded edge of a stair tread that extends over the riser

The vertical face of a stair step

The horizontal upper surface of a step in a stair, on which the foot is placed

A riser that is inclined inward to permit more footroom on the tread below

A continuous series of steps between one floor or landing of a building and the next

The angle of pitch above which a stair is considered to be uncomfortable or unsafe, usually 45°

The preferred ratio between the riser and tread of a stairstep

For a flight of stairs, any angle of pitch between 28° and 36°, or, for a ramp, an angle of pitch less than 5°

A sloping floor, walk, or roadway connecting two levels

A series of ramps connected by steps

A curved ramp

A stair extending from one level to another without turns or winders

A stair making a right-angled turn, consisting of two straight flights connected by an intervening landing or a series of winders

A stair that turns 180° or through two right angles at an intervening landing

One of the steps in a straight flight of stairs

A raised step or platform, esp. one serving as a landing or resting place at the end of a short flight of steps

A central post from which the winders of a spiral stair radiate

A half-return stair consisting of two straight flights immediately side by side and connected by an intervening landing

A half-turn stair having two intermediate landings, each offering a 90° change of direction

A stair requiring a three-quarter turn for continued ascent or descent

Any stair constructed chiefly with winders, such as a geometrical or spiral stair

A winding stair having a circular plan

A circular stair having wedge-shaped treads winding around and supported by a central post