The Collaborative International Dictionary of English v.0.48:

Ripple \Rip"ple\, n. [From Rip, v.]
   An implement, with teeth like those of a comb, for removing
   the seeds and seed vessels from flax, broom corn, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ripple \Rip"ple\, v. t.
   1. To remove the seeds from (the stalks of flax, etc.), by
      means of a ripple.
      [1913 Webster]

   2. Hence, to scratch or tear. --Holland.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ripple \Rip"ple\, v. i. [imp. & p. p. Rippled; p. pr. & vb. n.
   Rippling.] [Cf. Rimple, Rumple.]
   1. To become fretted or dimpled on the surface, as water when
      agitated or running over a rough bottom; to be covered
      with small waves or undulations, as a field of grain.
      [1913 Webster]

   2. To make a sound as of water running gently over a rough
      bottom, or the breaking of ripples on the shore.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ripple \Rip"ple\, v. t.
   To fret or dimple, as the surface of running water; to cover
   with small waves or undulations; as, the breeze rippled the
   lake.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ripple \Rip"ple\, n.
   1. The fretting or dimpling of the surface, as of running
      water; little curling waves.
      [1913 Webster]

   2. A little wave or undulation; a sound such as is made by
      little waves; as, a ripple of laughter.
      [1913 Webster]

   Ripple grass. (Bot.) See Ribwort.

   Ripple marks, a system of parallel ridges on sand, produced
      by wind, by the current of a steam, or by the agitation of
      wind waves; also (Geol.), a system of parallel ridges on
      the surface of a sandstone stratum.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ripple
    n 1: a small wave on the surface of a liquid [syn: ripple,
         rippling, riffle, wavelet]
    2: (electronics) an oscillation of small amplitude imposed on
       top of a steady value
    v 1: stir up (water) so as to form ripples [syn: ripple,
         ruffle, riffle, cockle, undulate]
    2: flow in an irregular current with a bubbling noise; "babbling
       brooks" [syn: ripple, babble, guggle, burble,
       bubble, gurgle]

Moby Thesaurus II by Grady Ward, 1.0:

138 Moby Thesaurus words for "ripple":
   agitate, agitation, babble, beat, beat up, billow, bore, breakers,
   broken ground, broken water, bubble, burble, chop, choppiness,
   chopping sea, churn, churn up, chute, cocker, cockle, comb, comber,
   convulse, corduroy, corduroy road, corrugate, corrugation, crankle,
   crease, crimp, crimple, crinkle, crumple, dimple, dirty water,
   disarrange, discompose, disquiet, disturb, eagre, excite, ferment,
   flurry, flutter, fret, furrow, goose bumps, goose pimples,
   gooseflesh, gravity wave, ground swell, guggle, gurgle, heave,
   heavy sea, heavy swell, hint, horripilation, knit, knot, lap, lift,
   lop, paddle, peak, perturb, perturbate, perturbation, plash,
   popple, pucker, purl, purse, rapid, rapids, ridge, riff, riffle,
   rile, rimple, ripple of applause, ripple of laughter, rise, rivel,
   roil, roll, roller, rough, rough water, roughen, ruck, ruckle,
   ruffle, rumple, sandpaper, sault, scend, sea, send, shake,
   shake up, shirr, shoot, slosh, soupcon, splash, stir, stir up,
   suggestion, surf, surge, swash, swell, swirl, swish, tidal bore,
   tidal wave, tide wave, trill, trouble, trough, tsunami, undulate,
   undulation, upset, wash, washboard, water wave, wave, wavelet,
   whip, whip up, whisk, white horses, whitecaps, wimple, work up,
   wrinkle