Source : Webster's Revised Unabridged Dictionary (1913)

Cockle \Coc"kle\, n. [AS. coccel, cocel; cf. Gael. cogall tares,
   husks, cockle.] (Bot.)
   (a) A plant or weed that grows among grain; the corn rose
       ({Luchnis Githage}).
   (b) The {Lotium}, or darnel.

Cockle \Coc"kle\, v. t. [imp. & p. p. {Cockled}; p. pr. & vb. n.
   {Cockling}.] [Of uncertian origin.]
   To cause to contract into wrinkles or ridges, as some kinds
   of cloth after a wetting.

   {Cockling sea}, waves dashing against each other with a short
      and quick motion. --Ham. Nav. Encyc.

Cockle \Coc"kle\ (k[o^]k"k'l), n. [OE. cockes cockles, AS.
   s[=ae]coccas sea cockles, prob, from Celtic; cf. W. cocs
   cockles, Gael. cochull husk. Perh. influenced by F. coquille
   shell, a dim. from the root of E. conch. Cf. {Coach}.]
   1. (Zo["o]l.) A bivalve mollusk, with radiating ribs, of the
      genus {Cardium}, especially {C. edule}, used in Europe for
      food; -- sometimes applied to similar shells of other
      genera.

   2. A cockleshell.

   3. The mineral black tourmaline or schorl; -- so called by
      the Cornish miners. --Raymond.

   4. The fire chamber of a furnace. [Eng.] --Knight.

   5. A hop-drying kiln; an oast. --Knight.

   6. The dome of a heating furnace. --Knight.

   {Cockle hat}, a hat ornamented with a cockleshell, the badge
      of a pilgrim. --Shak.

   {Cockle stairs}, winding or spiral stairs.

Source : WordNet®

cockle
     n 1: common edible European bivalve
     2: common edible European bivalve mollusk having a rounded
        shell with radiating ribs

cockle
     v 1: stir up (water) so as to form ripples [syn: {ripple}, {ruffle},
           {riffle}, {undulate}]
     2: to gather something into small wrinkles or folds; "She
        puckered her lips" [syn: {pucker}, {rumple}, {crumple}, {knit}]