baluster
/ˈbæləstə(r)/noun
1- a short pillar or column, typically decorative in design, forming part of a series supporting a rail or coping（多指设计精美支撑围栏的）栏杆小柱。
1.1
- as modifier(of a furniture leg or other decorative item) having the form of a baluster（家具支脚或其他装饰物）柱形的。
词源
early 17th cent.: from French balustre, from Italian balaustro, from balaust（r）a 'wild pomegranate flower' （via Latin from Greek balaustion）， so named because part of the pillar resembles the curving calyx tube of the flower.