This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A structure made of rails and upright members that is used as a guard or barrier or for support.

n. The upper rail of such a structure.

n. Rails considered as a group.

n. A fence or barrier consisting of one or more horizontal rails and vertical supports.

v. Present participle of rail.

adj. Expressing reproach; insulting.

n. A barrier made of a rail or of rails, together with vertical supports. The typical railing in the interior of structures or on porches has a horizontal rail near waist height, and multiple vertical supports. Its function is usually to provide a safety barrier at the edge of a verticle drop to prevent falls.

n. Rails in general; also, material for making rails.

n. Rails collectively; a combination of rails; a construction in which rails form an important part.

n. Hence Any openwork construction used as a barrier, parapet, or the like, primarily of wood, but also of iron bars, wire, etc.

n. material for making rails or rails collectively

n. a barrier consisting of a horizontal bar and supports

"Also in glass, the staircase railing is an absolute expression of discretion, a way to give the voids centre stage."

material   

post and railing   

guard railing    hand railing   

insulting    barrier    balustrade    banister   

rail   

ailing    assailing    bailing    baling    curtailing    derailing    detailing    emailing    entailing    failing   

balustrade    banister    rail    balcony    grille    parapet    hinge    girder    palisade    handrail