The upright post about which the steps of a circular staircase wind; hence, in stairs having straight flights, the principal post at the foot of a staircase, or the secondary ones at the landings. See Hollow newel, under Hollow.
Hollow newel (Arch.), an opening in the center of a winding staircase in place of a newel post, the stairs being supported by the wall; an open newel; also, the stringpiece or rail winding around the well of such a staircase.
also called a central pole or support column, is the central supporting pillar of a staircase. It can also (usually as "newel post") refer to an upright post that supports the handrail of a stair banister. In stairs having straight flights it is the principal post at the foot of the staircase, but the term can also be used for the intermediate posts on landings and at the top of a staircase. Although its primary purpose is structural, newels have long been adorned with decorative trim and designed with different architectural styles.
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The moleman bumped into the newel post at the bottom of the stairs.
John Irving. A Widow for One Year, p.408 (1998)
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I actually wrapped my hands around our newel post when he asked me this, I clung to it.
Gillian Flynn. Gone Girl, p.204 (2012)
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three continuous flights at successive right angles, of varnished cleargrained oak, treads and risers, newel, balusters and handrail, with steppedup panel dado, dressed with camphorated wax: bathroom, hot and cold supply,