The Collaborative International Dictionary of English v.0.48:

Gyre \Gyre\ (j[imac]r), n. [L. gyrus, Gr. gy^ros, cf. gyro`s
   round.]
   A circular motion, or a circle described by a moving body; a
   turn or revolution; a circuit.
   [1913 Webster]

         Quick and more quick he spins in giddy gyres. --Dryden.
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         Still expanding and ascending gyres.     --Mrs.
                                                  Browning.
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The Collaborative International Dictionary of English v.0.48:

Gyre \Gyre\, v. t. & i. [Cf. OF. gyrer, girer. See Gyrate.]
   To turn round; to gyrate. [Obs.] --Bp. Hall. --Drayton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gyre
    n 1: a round shape formed by a series of concentric circles (as
         formed by leaves or flower petals) [syn: coil, whorl,
         roll, curl, curlicue, ringlet, gyre, scroll]