The Collaborative International Dictionary of English v.0.48:

Twirl \Twirl\, v. i.
   To revolve with velocity; to be whirled round rapidly.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twirl \Twirl\, n.
   1. The act of twirling; a rapid circular motion; a whirl or
      whirling; quick rotation.
      [1913 Webster]

   2. A twist; a convolution. --Woodward.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twirl \Twirl\ (tw[~e]rl), v. t. [imp. & p. p. Twirled
   (tw[~e]rld); p. pr. & vb. n. Twirling.] [Cf. AS.
   [thorn]wiril a churn staff, a stirrer, flail, [thorn]weran,
   [=a][thorn]weran, to agitate, twirl, G. zwirlen, quirlen,
   querlen to twirl, to turn round or about, quirl a twirling
   stick, OHG. dweran to twirl, stir. Cf. Trowel.]
   To move or turn round rapidly; to whirl round; to move and
   turn rapidly with the fingers.
   [1913 Webster]

         See ruddy maids,
         Some taught with dexterous hand to twirl the wheel.
                                                  --Dodsley.
   [1913 Webster]

         No more beneath soft eve's consenting star
         Fandango twirls his jocund castanet.     --Byron.
   [1913 Webster]

WordNet (r) 3.0 (2006):

twirl
    n 1: a sharp bend in a line produced when a line having a loop
         is pulled tight [syn: kink, twist, twirl]
    2: the act of rotating rapidly; "he gave the crank a spin"; "it
       broke off after much twisting" [syn: spin, twirl,
       twist, twisting, whirl]
    v 1: turn in a twisting or spinning motion; "The leaves swirled
         in the autumn wind" [syn: twirl, swirl, twiddle,
         whirl]
    2: cause to spin; "spin a coin" [syn: whirl, birl, spin,
       twirl]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "twirl":
   Charybdis, Maelstrom, back stream, backflow, backwash, backwater,
   centrifugate, centrifuge, cirrus, coil, contort, convolution,
   corkscrew, countercurrent, counterflow, counterflux, crinkle, curl,
   curlicue, dizzy round, eddy, evolute, gulf, gurge, gyrate, gyre,
   helix, intort, involute, kink, maelstrom, meander, pirouette, purl,
   rat race, reel, refluence, reflux, regurgitation, revolution,
   revolve, ringlet, roll, rotate, round, scallop, screw, scroll,
   serpentine, slink, snake, spin, spinning, spiral, surge, swirl,
   tendril, turn, turning, twine, twirling, twist, twist and turn,
   volute, volution, vortex, wheel, whirl, whirligig, whirling,
   whirlpool, whirlwind, whorl, wind, winding, worm, wring