The Collaborative International Dictionary of English v.0.48:

Corral \Cor*ral"\ (k?r-r?l"; Sp. k?r-r?l"), n. [Sp., a yard, a
   yard for cattle, fr. corro a circle or ring, fr. L. currere
   to run. Cf. Kraal.]
   A pen for animals; esp., an inclosure made with wagons, by
   emigrants in the vicinity of hostile Indians, as a place of
   security for horses, cattle, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Corral \Cor*ral"\, v. t. [imp. & p. p. Corraled (-r?ld" or
   -r?ld"); p. pr. & vb. n. Corralling.]
   To surround and inclose; to coop up; to put into an inclosed
   space; -- primarily used with reference to securing horses
   and cattle in an inclosure of wagons while traversing the
   plains, but in the Southwestern United States now
   colloquially applied to the capturing, securing, or penning
   of anything. --Bartlett.
   [1913 Webster]

WordNet (r) 3.0 (2006):

corral
    n 1: a pen for cattle [syn: cow pen, cattle pen, corral]
    v 1: enclose in a corral; "corral the horses"
    2: arrange wagons so that they form a corral
    3: collect or gather; "corralling votes for an election"

Moby Thesaurus II by Grady Ward, 1.0:

140 Moby Thesaurus words for "corral":
   accumulate, acquire, agglomerate, aggregate, aggroup, amass,
   assemble, bag, batch, be seized of, beleaguer, beset, besiege,
   blockade, bound, box in, bring together, bulk, bunch,
   bunch together, bunch up, cage, capture, catch, chamber, close in,
   clump, cluster, collect, colligate, collocate, combine, come by,
   come in for, come into, compare, compass, compile, conglomerate,
   contain, contract, coop, coop in, coop up, cordon, cordon off,
   cumulate, derive, dig up, drag down, draw, draw together,
   dredge up, drive, drive together, drove, earn, encircle, enclose,
   encompass, enshrine, enter into possession, fence, fence in, gain,
   gather, gather in, gather together, get, get in, get together,
   goad, group, harvest, hedge, hedge in, hem, hem in, herd, house in,
   impound, imprison, incarcerate, include, jail, join, juxtapose,
   kennel, lash, leaguer, lump together, make, make up, mass, match,
   mew, mew up, mobilize, muster, net, obtain, pair, partner, pen,
   pen in, pocket, prick, procure, pull down, punch cattle,
   put together, quarantine, rail in, raise, rake up, rally, reap,
   ride herd on, round up, sack, score, scrape together, secure,
   shepherd, shrine, shut in, shut up, spur, stable, surround, take,
   take up, wall in, whip, whip in, win, wrangle, wrap, yard,
   yard up