nosing

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nos·ing

 (nō′zĭng)
n.
1.
a. The horizontally projecting edge of a stair tread.
b. A shield covering this edge.
2. A projecting edge of a molding.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

nosing

(ˈnəʊzɪŋ)
n
1. (Building) the edge of a step or stair tread that projects beyond the riser
2. (Architecture) a projecting edge of a moulding, esp one that is half-round
[C18: from nose + -ing1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

nos•ing

(ˈnoʊ zɪŋ)

n.
a projecting edge, as the part of the tread of a step extending beyond the riser.
[1765–75]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
DeckSafe Solutions says its comprehensive access and stair safety ranges will also be on display including stair tread covers, landing covers, solid gritted plate and stair nosing which ensures access areas remain slip resistant at all times however difficult the conditions.
Floors in schools are often stone, and the stair nosing is often steel.
They specialise in items such as ramps, wood to carpet bars and stair nosing. They have a huge selection of woods and will colourmatch to suit your flooring.
2 Plumb up from the front edge of the top stair nosing and stick a piece of tape to the wall.
The extra joists and blocking on the front of both the upper and the lower sections are needed to support the deck board that forms the stair nosing (Photo 8 and Figure C).
Use a handsaw to notch out the top stair nosing (Photo 1) in order to fit the skirt tight against the top riser (the vertical board under each step).