The Collaborative International Dictionary of English v.0.48:

Rotator \Ro*ta"tor\, n. [L.]
   1. (Anat.) that which gives a rotary or rolling motion, as a
      muscle which partially rotates or turns some part on its
      axis.
      [1913 Webster]

   2. (Metal.) A revolving reverberatory furnace.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "rotator":
   carousel, centrifuge, chuck, disk, drill, extractor, fan, governor,
   gyroscope, impeller, jack, merry-go-round, propeller, reel, roller,
   rolling pin, rolling stone, rotary drill, rotor, roundabout,
   rundle, screw, spindle, spinner, spit, spool, teetotum, top,
   treadmill, turbine, turntable, wheel, whirlabout, whirler,
   whirligig, whorl, windmill