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(building construction)
Projection of a tread of a stair beyond the riser below it.
(civil engineering)
A transverse, horizontal motion of a locomotive that exerts a lateral force on the track.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


The rounded edge of a horizontal surface that projects beyond the vertical surface below, such as the projection of a tread beyond the riser.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

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 ?
It's difficult to get the plywood and nosing to line up perfectly flush when you clamp them together.
Since the glue hasn't reached full strength, you still have to be careful not to jar the nosing loose.
Tilting it away will bevel the nosing. If the nosing isn't quite flush, finish by hand-sanding.