ripple

from The Century Dictionary.

• noun A large comb or hatchel for separating the seeds or capsules from flax; also, in the United States, a toothed instrument for removing the seeds from broomcorn.
• To assume or wear a ruffled surface, as water when agitated by a gentle wind or by running over a stony bottom; be covered with small waves or undulations.
• To make a sound as of water running over a rough bottom: as, laughter rippling pleasantly.
• To fret or agitate lightly, as the surface of water; form in small waves or undulations; curl.
• To mark with or as with ripples. See ripple-mark.
• noun In mathematics, a wave whose length is less than that for which the velocity of propagation is a minimum.
• noun The light fretting or ruffling of the surface of water; a little curling wave; an undulation.
• noun A sound like that of water running over a stony bottom: as, a ripple of laughter.
• noun A small coppice.
• To clean or remove the seeds or capsules from, as from the stalks of flax.
• noun Same as rip.
• To scratch or break slightly; graze.
• noun A weakness in the back and loins, attended with shooting pains: a form of tabes dorsualis, the same as Friedrich's ataxia (which see, under ataxia).

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To remove the seeds from (the stalks of flax, etc.), by means of a ripple.
• transitive verb Hence, to scratch or tear.
• noun An implement, with teeth like those of a comb, for removing the seeds and seed vessels from flax, broom corn, etc.
• transitive verb To fret or dimple, as the surface of running water; to cover with small waves or undulations.
• intransitive verb 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.
• intransitive verb To make a sound as of water running gently over a rough bottom, or the breaking of ripples on the shore.
• noun The fretting or dimpling of the surface, as of running water; little curling waves.
• noun A little wave or undulation; a sound such as is made by little waves.
• noun (Bot.) See Ribwort.
• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A moving disturbance or undulation in the surface of a liquid.
• noun A sound similar to that of undulating water.
• noun A style of ice cream in which flavors have been coarsely blended together.
• noun electronics A small oscillation of an otherwise steady signal.
• verb To move like the undulating surface of a body of water; to undulate.
• verb To propagate like a moving wave.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb flow in an irregular current with a bubbling noise
• noun (electronics) an oscillation of small amplitude imposed on top of a steady value
• verb stir up (water) so as to form ripples
• noun a small wave on the surface of a liquid