The Collaborative International Dictionary of English v.0.48:

Twister \Twist"er\, n.
   1. One who twists; specifically, the person whose occupation
      is to twist or join the threads of one warp to those of
      another, in weaving.
      [1913 Webster]

   2. The instrument used in twisting, or making twists.
      [1913 Webster]

            He, twirling his twister, makes a twist of the
            twine.                                --Wallis.
      [1913 Webster]

   3. (Carp.) A girder. --Craig.
      [1913 Webster]

   4. (Man.) The inner part of the thigh, the proper place to
      rest upon when on horseback. --Craig.
      [1913 Webster]
      [1913 Webster]

WordNet (r) 3.0 (2006):

twister
    n 1: a localized and violently destructive windstorm occurring
         over land characterized by a funnel-shaped cloud extending
         toward the ground [syn: tornado, twister]
    2: small friedcake formed into twisted strips and fried; richer
       than doughnuts [syn: cruller, twister]