bal·us·ter /ˈbæləstɚ/
欄杆的支柱,欄杆
Bal·us·ter n. Arch. 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. [Corrupted into banister.]
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baluster
n : one of a number of closely spaced supports for a railing