01 n. A small column or pilaster, used as a support to the rail of an open parapet, to guard the side of a staircase, or the front of a gallery. …
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1.
A small column or pilaster, used as a support to the rail of an open parapet, to guard the side of a staircase, or the front of a gallery. See Balustrade.(Arch.) See: Balustrade