baluster

詳細解釋：

bal.us.ter

n.（名詞）

One of the upright, usually rounded or vase-shaped supports of a balustrade.
欄桿柱：一種直立的，通常為圓形或花瓶形的欄桿支撐物
An upright support, such as a furniture leg, having a similar shape.
支柱：一種直立的具有相似形狀的支撐物，如家具腿
One of the supporting posts of a handrail.
扶欄支柱

來源：
French balustre
法文 balustre
from Italian balaustro
源自 義大利語 balaustro
from balaustra [pomegranate flower (from a resemblance to the post)]
源自 balaustra [石榴花（因與柱桿相似而得名）]
from Latin balaustium
源自 拉丁語 balaustium
from Greek balaustion
源自 希臘語 balaustion