newel

noun4

1. •
   Either of two kinds of supporting post in a staircase.
2. •
   A central pillar around which some types of spiral staircase are spiralled.
3. •
   A sturdy pillar at the top or bottom of a flight of stairs, supporting the handrail.

   • We went along the hall to the end and up a flight of stairs with a carved handrail and newel post. — 1943
4. •
   (no longer used) A novelty; a new thing.

   • He was so enamoured with the newel. — 1882