stair nosing

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nosing, nose

The prominent, usually rounded, horizontal edge which extends beyond an upright face below; as the projection of a tread beyond a riser.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
With the rail resting on the front of the stair treads, mark where the rail contacts the top stair nosing (see inset photo).
11 Run the edge of your saw bed against the straightedge to cut a straight line for the recessed stair nosing board.
Along the edge of the lower platform and at the stairs, use square-edged rather than tongue-and groove decking (Photo 11 inset and Photo 19), Photo 19 shows how to cut and nail the stair nosings and border pieces.
Rest a length of 1x2 across the stair nosings. Use a stud finder to locate a wall stud (framing member).