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