The Collaborative International Dictionary of English v.0.48:

Ringlet \Ring"let\, n. [Ring + -let.]
   1. A small ring; a small circle; specifically, a fairy ring.
      [1913 Webster]

            You demi-puppets, that
            By moonshine do the green sour ringlets make,
            Whereof the ewe not bites.            --Shak.
      [1913 Webster]

   2. A curl; especially, a curl of hair.
      [1913 Webster]

            [Her golden tresses] in wanton ringlets waved.
                                                  --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ringlet
    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]
    2: a strand or cluster of hair [syn: lock, curl, ringlet,
       whorl]
    3: a small ring
    4: any of various butterflies belonging to the family Satyridae
       [syn: ringlet, ringlet butterfly]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "ringlet":
   annulet, circlet, cirrus, coil, corkscrew, crimp, curl, curlicue,
   evolute, eye, eyelet, frizz, frizzle, grommet, gyre, helix,
   involute, kink, lock, ponytail, roll, roundlet, screw, scroll,
   spiral, swirl, tendril, twirl, twist, volute, volution, vortex,
   whirl, whorl