The Collaborative International Dictionary of English v.0.48:

Surround \Sur*round"\, n.
   A method of hunting some animals, as the buffalo, by
   surrounding a herd, and driving them over a precipice, into a
   ravine, etc. [U.S.] --Baird.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Surround \Sur*round"\, v. t. [imp. & p. p. Surrounded; p. pr.
   & vb. n. Surrounding.] [OF. suronder to overflow, LL.
   superundare; fr. L. super over + undare to rise in waves,
   overflow, fr. unda wave. The English sense is due to the
   influence of E. round. See Super-, and Undulate, and cf.
   Abound.]
   1. To inclose on all sides; to encompass; to environ.
      [1913 Webster]

   2. To lie or be on all sides of; to encircle; as, a wall
      surrounds the city.
      [1913 Webster]

            But could instead, and ever-during dark
            Surrounds me.                         --Milton.
      [1913 Webster]

   3. To pass around; to travel about; to circumnavigate; as, to
      surround the world. [Obs.] --Fuller.
      [1913 Webster]

   4. (Mil.) To inclose, as a body of troops, between hostile
      forces, so as to cut off means of communication or
      retreat; to invest, as a city.
      [1913 Webster]

   Syn: To encompass; encircle; environ; invest; hem in; fence
        about.
        [1913 Webster]

WordNet (r) 3.0 (2006):

surround
    n 1: the area in which something exists or lives; "the country--
         the flat agricultural surround" [syn: environment,
         environs, surroundings, surround]
    v 1: extend on all sides of simultaneously; encircle; "The
         forest surrounds my property" [syn: surround, environ,
         ring, skirt, border]
    2: envelop completely; "smother the meat in gravy" [syn:
       smother, surround]
    3: surround so as to force to give up; "The Turks besieged
       Vienna" [syn: besiege, beleaguer, surround, hem in,
       circumvent]
    4: surround with a wall in order to fortify [syn: wall,
       palisade, fence, fence in, surround]

Moby Thesaurus II by Grady Ward, 1.0:

184 Moby Thesaurus words for "surround":
   ambiance, ambience, atmosphere, begird, beleaguer, beset, besiege,
   blockade, bound, box, box in, cage, carry, case, chamber, circle,
   circle in, circuit, circuiteer, circulate, circumambulate,
   circummigrate, circumnavigate, circumscribe, circumvent, close,
   close in, close the circle, come full circle, compass,
   compass about, comprise, confine, consume, contain, coop, coop in,
   coop up, cordon, cordon off, corral, cover, crate, cycle, define,
   delimit, delimitate, demarcate, describe a circle, determine,
   devour, dispatch, dispose of, divide, down, eat up, edge, embay,
   embed, embosom, embox, embrace, encapsulate, encase, encircle,
   enclasp, enclave, enclose, encompass, enfold, enshrine, enshroud,
   envelop, environ, environment, environs, enwrap, extend, fence in,
   fix, flank, fringe, get away with, get down, gird, girdle,
   girdle the globe, go, go about, go around, go out, go round,
   go the round, gyre, harass, harry, hedge in, hem, hem in, hold,
   house in, impound, imprison, incarcerate, include, ingest,
   internalize, invest, involve, jail, keep within, kennel, lap,
   lay off, lay siege to, leaguer, lie, limit, loop, make a circuit,
   margin, mark boundaries, mark off, mark out, mark the periphery,
   mew, mew up, orbit, outline, pack, package, pen, pen in, pocket,
   put away, put in, quarantine, rail in, range, reach, reach out,
   revolve, rim, ring, rope off, round, run, separate, set the limit,
   setting, sheathe, shrine, shroud, shut in, shut up, skirt, smother,
   soften up, span, specify, spiral, spread, stable, stake out,
   straddle, stretch, stretch out, surroundings, swaddle, swallow,
   swathe, sweep, take down, take in, thrust out, tuck in, verge,
   wall in, wheel, wrap, wrap about, wrap up, yard, yard up