The Collaborative International Dictionary of English v.0.48:

Gyrate \Gy"rate\ (j[imac]"r[asl]t), a. [L. gyratus made in a
   circular form, p. p. of gyrare.]
   Winding or coiled round; curved into a circle; taking a
   circular course.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gyrate \Gy"rate\ (j[imac]"r[=a]t), v. i. [imp. & p. p. Gyrated
   (j[imac]"r[asl]*t[e^]d); p. pr. & vb. n. Gyrating.] [L.
   gyratus, p. p. of gyrare to gyrate. See Gyre, n.]
   To revolve round a central point; to move spirally about an
   axis, as a tornado; to revolve.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gyrate
    v 1: to wind or move in a spiral course; "the muscles and nerves
         of his fine drawn body were coiling for action"; "black
         smoke coiling up into the sky"; "the young people gyrated
         on the dance floor" [syn: gyrate, spiral, coil]
    2: revolve quickly and repeatedly around one's own axis; "The
       dervishes whirl around and around without getting dizzy"
       [syn: spin, spin around, whirl, reel, gyrate]