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stepclick to hear

Part of a staircase composed of a tread and a riser.
step tread riser rise nosing

tread click to hear

Level part where the foot is placed in climbing or descending.

riser click to hear

Vertical surface beneath a tread and forming its front.

rise click to hear

Vertical length between two consecutive treads.

nosing click to hear

End of a tread that juts out over the riser below it.