a large round stone, metal or wooden post that is used to support a bridge, the roof of a building, etc., especially when it is also decorative （尤指兼作装饰的）柱子，桥墩
a large round stone, metal or wooden post that is used to support a bridge, the roof of a building, etc., especially when it is also decorative （尤指兼作装饰的）柱子，桥墩