siding

(sīd)

noun

  1. ☆ a covering for an outside wall, as of a frame building, consisting generally of overlapping shingles, boards, aluminum panels, etc.
  2. a short railroad track connected with a main track by a switch and used for unloading, bypassing, etc.; sidetrack

See siding in American Heritage Dictionary 4

noun
  1. Material, such as boards or shingles, used for surfacing the outside walls of a frame building.
  2. A short section of railroad track connected by switches with a main track.

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