siding

Meanings

1. A building material which covers and protects the sides of a house or other building.

1. present participle and gerund of side

1. A second, relatively short length of track just to the side of a railroad track, joined to the main track by switches at one or both ends, used either for loading or unloading freight, storing trains or other rail vehicles; or to allow two trains on a same track to meet (opposite directions) or pass (same direction) (the latter sense is probably an American definition).

Etymology

From side + -ing (“material, collection”).