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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.
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
a projecting edge, as the part of the tread of a step extending beyond the riser.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.