1.nounA building material which covers and protects the sides of a house or other building.
"Ugh. If there's one thing I can't stand it's cheesy vinyl siding."
2.nounA 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).