The Collaborative International Dictionary of English v.0.48:

Scud \Scud\ (sk[u^]d), v. i. [imp. & p. p. Scudded; p. pr. &
   vb. n. Scudding.] [Dan. skyde to shoot, shove, push, akin
   to skud shot, gunshot, a shoot, young bough, and to E. shoot.
   [root]159. See Shoot.]
   1. To move swiftly; especially, to move as if driven forward
      by something.
      [1913 Webster]

            The first nautilus that scudded upon the glassy
            surface of warm primeval oceans.      --I. Taylor.
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            The wind was high; the vast white clouds scudded
            over the blue heaven.                 --Beaconsfield.
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   2. (Naut.) To be driven swiftly, or to run, before a gale,
      with little or no sail spread.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scud \Scud\, v. t.
   To pass over quickly. [R.] --Shenstone.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scud \Scud\, n.
   1. The act of scudding; a driving along; a rushing with
      precipitation.
      [1913 Webster]

   2. Loose, vapory clouds driven swiftly by the wind.
      [1913 Webster]

            Borne on the scud of the sea.         --Longfellow.
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            The scud was flying fast above us, throwing a veil
            over the moon.                        --Sir S.
                                                  Baker.
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   3. A slight, sudden shower. [Prov. Eng.] --Wright.
      [1913 Webster]

   4. (Zool.) A small flight of larks, or other birds, less than
      a flock. [Prov. Eng.]
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   5. (Zool.) Any swimming amphipod crustacean.
      [1913 Webster]

   Storm scud. See the Note under Cloud.
      [1913 Webster]

WordNet (r) 3.0 (2006):

scud
    n 1: the act of moving along swiftly (as before a gale) [syn:
         scud, scudding]
    v 1: run or move very quickly or hastily; "She dashed into the
         yard" [syn: dart, dash, scoot, scud, flash,
         shoot]
    2: run before a gale [syn: scud, rack]

Moby Thesaurus II by Grady Ward, 1.0:

167 Moby Thesaurus words for "scud":
   Cloudcuckooland, alto-cumulus, alto-stratus, anvil cloud,
   banner cloud, billowy cloud, blast, blow, bolt, brash, breakers,
   burst, burst of rain, burst of speed, canter, cap cloud, career,
   cirro-cumulus, cirro-fillum, cirro-nebula, cirro-stratus,
   cirro-velum, cirrus, cirrus cloud, cirrus haze, cirrus stripe,
   cloud, cloud band, cloud bank, cloud drift, cloud mass,
   cloud street, cloudburst, cloudland, cloudling, cloudscape,
   cocktail, collar, cottony cloud, cumulo-cirro-stratus,
   cumulo-cirrus, cumulo-nimbus, cumulo-stratus, cumulus,
   cumulus cloud, curl cloud, dart, dash, dead run, deluge, dogtrot,
   downfall, downflow, downpour, drencher, drift, flank speed,
   flat-out speed, flaw, fleecy cloud, fling, float, flood, flurry,
   fly, foam, foot, forced draft, fractocumulus, froth, full gallop,
   gallop, ghost, glide, gushing rain, gust, hand gallop, haste,
   hasten, head, headlong rush, heavy rain, heavy right foot, hie,
   high fog, high lope, hump, hump it, hurry, hurtle, jog trot,
   lather, lope, mackerel sky, make haste, mammatocumulus,
   maximum speed, meringue, mousse, mushroom cloud, nimbus,
   nimbus cloud, offscum, open throttle, plash, plow the deep, plunge,
   post, pour, puff, race, rain cloud, rainburst, rainspout,
   rainstorm, ride, ride the sea, run, rush, sail, scamper, scoot,
   scour, scramble, scum, scurry, scuttle, sea foam, shoot, skedaddle,
   skim, slip, snail cloud, soaker, soaking rain, soapsuds, souffle,
   spate, speed, spindrift, spoondrift, spout, spray, sprint, spume,
   spurt, squall cloud, step on it, stinging, storm cloud,
   strato-cumulus, stratus, stratus cloud, suds, surf, tear,
   thundercloud, thunderhead, torrent of rain, trot, walk the waters,
   water carrier, waterspout, white water, wide-open speed, wind gust,
   woolpack