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]