corkscrew stairs

a spiral staircase around a solid newel.

See also: corkscrew

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
with floors at uneven levels and wearying corkscrew stairs ...
A Library with a future: T.G. Otte goes to the heart of Whitehall to explore the origins and future of an important government archive which is becoming far more accessible to historians
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