Etymology
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railing (n.)

late 14c., "the attaching (of a plant, vine, etc.) to a prop or stake;" early 15c., "construction in which rails form an important part," verbal noun from rail (v.2). Technically, railings (late 15c.) are horizontal, palings are vertical.

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Definitions of railing

railing (n.)
a barrier consisting of a horizontal bar and supports;
Synonyms: rail
railing (n.)
material for making rails or rails collectively;
From wordnet.princeton.edu