Un siding

siding

[sahy-ding]
noun
1.
a short railroad track, opening onto a main track at one or both ends, on which one of two meeting trains is switched until the other has passed.
2.
any of several varieties of weatherproof facing for frame buildings, composed of pieces attached separately as shingles, plain or shaped boards, or of various units of sheet metal or various types of composition materials.

Origin:
1595–1605; side1 + -ing1

unsiding, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
siding (ˈsaɪdɪŋ)
 
n
1.  a short stretch of railway track connected to a main line, used for storing rolling stock or to enable trains on the same line to pass
2.  a short railway line giving access to the main line for freight from a factory, mine, quarry, etc
3.  (US), (Canadian) material attached to the outside of a building to make it weatherproof

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

siding
c.1600, "a taking of sides in a conflict or debate," from side (q.v.). First attested 1825 in the railroad sense; 1829 in the architectural sense of "boarding on the sides of a building."
Online Etymology Dictionary, © 2010 Douglas Harper
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