n. 栏杆的支柱, 楼梯的扶栏

[ noun ]
a railing at the side of a staircase or balcony to prevent people from falling
<noun.artifact>

Banister \Ban"is*ter\, n. [A corruption of baluster.]
1. A baluster.

2. (sing. or pl.) The balustrade of a staircase. Formerly
used in this sense mostly in the plural, now mostly in the
singular. [Also spelled {bannister}.]
[1913 Webster +PJC]

He struggled to ascend the pulpit stairs, holding
hard on the banisters. --Sir W.
Scott.

Baluster \Bal"us*ter\, n. [F. balustre, It. balaustro, fr. L.
balaustium the flower of the wild pomegranate, fr. Gr.
balay`stion; -- so named from the similarity of form.]
(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}.]