corkscrew stairs

from The Collaborative International Dictionary of English v.0.48
corkscrew \cork"screw`\ (k[^o]rk"skr[udd]`), a.
   shaped like a corkscrew; spiral; helical.
   [PJC]

   {corkscrew stairs}, a spiral staircase around a solid newel.
      [1913 Webster]
    

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