siding

siding /ˈsaɪdɪŋ/ noun
plural sidings
siding
/ˈsaɪdɪŋ/
noun
plural sidings
Britannica Dictionary definition of SIDING
1 
[noncount] US : long pieces of material that are used to cover the outside walls of a building
— called also (chiefly British) cladding
2 
[count] : a short railroad track that is connected with the main track