step![click to hear](/images/speaker.jpg)
Part of a staircase composed of a tread and a riser.
tread ![click to hear](/images/speaker.jpg)
Level part where the foot is placed in climbing or descending.
riser ![click to hear](/images/speaker.jpg)
Vertical surface beneath a tread and forming its front.
rise ![click to hear](/images/speaker.jpg)
Vertical length between two consecutive treads.
nosing ![click to hear](/images/speaker.jpg)
End of a tread that juts out over the riser below it.