Source : Webster's Revised Unabridged Dictionary (1913)

Guerilla \Gue*ril"la\, a.
   See {Guerrilla}.

Source : WordNet®

guerilla
     adj : used of independent armed resistance forces; "guerrilla
           warfare"; "partisan forces" [syn: {guerrilla(a)}, {guerilla(a)},
            {underground}, {irregular}]

guerilla
     n : a member of an irregular armed force that fights a stronger
         force by sabotage and harassment [syn: {guerrilla}, {irregular},
          {insurgent}]