The Collaborative International Dictionary of English v.0.48:

coiled \coiled\ (koild), adj.
   curled or wound especially in concentric rings or spirals;
   as, a coiled snake ready to strike; the rope lay coiled on
   the deck. Opposite of uncoiled.

   Note: [Narrower terms: coiling, helical, spiral, spiraling,
         volute, voluted, whorled; convolute rolled
         longitudinally upon itself;curled, curled up;
         involute closely coiled so that the axis is
         obscured); looped, whorled; twined, twisted;
         convoluted; involute, rolled esp of petals or leaves
         in bud: having margins rolled inward); wound]
         [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Coil \Coil\ (koil), v. t. [imp. & p. p. Coiled (koild); p. pr.
   & vb. n. Coiling.] [OF. coillir, F. cueillir, to collect,
   gather together, L. coligere; col- + legere to gather. See
   Legend, and cf. Cull, v. t., Collect.]
   1. To wind cylindrically or spirally; as, to coil a rope when
      not in use; the snake coiled itself before springing.
      [1913 Webster]

   2. To encircle and hold with, or as with, coils. [Obs. or R.]
      --T. Edwards.
      [1913 Webster]

WordNet (r) 3.0 (2006):

coiled
    adj 1: curled or wound (especially in concentric rings or
           spirals); "a coiled snake ready to strike"; "the rope lay
           coiled on the deck" [ant: straight, uncoiled]