The Collaborative International Dictionary of English v.0.48:

Barrack \Bar"rack\, n. [F. baraque, fr. It. baracca (cf. Sp.
   barraca), from LL. barra bar. See Bar, n.]
   [1913 Webster]
   1. (Mil.) A building for soldiers, especially when in
      garrison. Commonly in the pl., originally meaning
      temporary huts, but now usually applied to a permanent
      structure or set of buildings.
      [1913 Webster]

            He lodged in a miserable hut or barrack, composed of
            dry branches and thatched with straw. --Gibbon.
      [1913 Webster]

   2. A movable roof sliding on four posts, to cover hay, straw,
      etc. [Local, U.S.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barrack \Bar"rack\, v. t.
   To supply with barracks; to establish in barracks; as, to
   barrack troops.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barrack \Bar"rack\, v. i.
   To live or lodge in barracks.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barrack
    n 1: a building or group of buildings used to house military
         personnel
    v 1: lodge in barracks
    2: spur on or encourage especially by cheers and shouts; "The
       crowd cheered the demonstrating strikers" [syn: cheer,
       root on, inspire, urge, barrack, urge on, exhort,
       pep up]
    3: laugh at with contempt and derision; "The crowd jeered at the
       speaker" [syn: jeer, scoff, flout, barrack, gibe]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

BARRACK. By this term, as used in Pennsylvania, is understood an erection of
upright posts supporting a sliding roof, usually of thatch. 5 Whart. R. 429.



The Devil's Dictionary (1881-1906):

BARRACK, n.  A house in which soldiers enjoy a portion of that of
which it is their business to deprive others.