The Collaborative International Dictionary of English v.0.48:

Gravel \Grav"el\, v. t. [imp. & p. p. Graveledor Gravelled;
   p. pr. & vb. n. Graveling or Gravelling.]
   [1913 Webster]
   1. To cover with gravel; as, to gravel a walk.
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   2. To run (as a ship) upon the gravel or beach; to run
      aground; to cause to stick fast in gravel or sand.
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            When we were fallen into a place between two seas,
            they graveled the ship.               --Acts xxvii.
                                                  41 (Rhemish
                                                  version).
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            Willam the Conqueror . . . chanced as his arrival to
            be graveled; and one of his feet stuck so fast in
            the sand that he fell to the ground.  --Camden.
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   3. To check or stop; to embarrass; to perplex. [Colloq.]
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            When you were graveled for lack of matter. --Shak.
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            The physician was so graveled and amazed withal,
            that he had not a word more to say.   --Sir T.
                                                  North.
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   4. To hurt or lame (a horse) by gravel lodged between the
      shoe and foot.
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The Collaborative International Dictionary of English v.0.48:

Gravel \Grav"el\, n. [OF. gravele, akin to F. gr?ve a sandy
   shore, strand; of Celtic origin; cf. Armor. grouan gravel, W.
   gro coarse gravel, pebbles, and Skr. gr[=a]van stone.]
   1. Small stones, or fragments of stone; very small pebbles,
      often intermixed with particles of sand.
      [1913 Webster]

   2. (Med.) A deposit of small calculous concretions in the
      kidneys and the urinary or gall bladder; also, the disease
      of which they are a symptom.
      [1913 Webster]

   Gravel powder, a coarse gunpowder; pebble powder.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gravel
    n 1: rock fragments and pebbles [syn: gravel, crushed rock]
    v 1: cause annoyance in; disturb, especially by minor
         irritations; "Mosquitoes buzzing in my ear really bothers
         me"; "It irritates me that she never closes the door after
         she leaves" [syn: annoy, rag, get to, bother, get
         at, irritate, rile, nark, nettle, gravel, vex,
         chafe, devil]
    2: cover with gravel; "We gravelled the driveway"
    3: be a mystery or bewildering to; "This beats me!"; "Got me--I
       don't know the answer!"; "a vexing problem"; "This question
       really stuck me" [syn: perplex, vex, stick, get,
       puzzle, mystify, baffle, beat, pose, bewilder,
       flummox, stupefy, nonplus, gravel, amaze,
       dumbfound]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "gravel":
   Tarmac, Tarvia, asphalt, bitumen, bituminous macadam, blacktop,
   breccia, brick, cement, chafe, cobble, cobblestone, concrete, curb,
   curbing, curbstone, debris, detritus, edgestone, exacerbate, flag,
   flagging, flagstone, fret, gall, grain, granule, granulet, grate,
   grate on, grit, irritate, kerb, kerbstone, macadam, pavement,
   pavestone, paving, paving stone, provoke, rasp, road metal, sand,
   set on edge, shingle, stone, tarmacadam, tile, washboard