newel
/ˈnjuːəl/noun
1- the central supporting pillar of a spiral or winding staircase螺旋型楼梯中柱。
1.1
- （亦作newel post）a post at the head or foot of a flight of stairs, supporting a handrail楼梯端柱。
词源
late Middle English: from Old French nouel 'knob', from medieval Latin nodellus, diminutive of Latin nodus 'knot'.