The Collaborative International Dictionary of English v.0.48:

Bellicose \Bel"li*cose`\, a. [L. bellicosus, fr. bellicus of
   war, fr. bellum war. See Duel.]
   Inclined to war or contention; warlike; pugnacious.
   [1913 Webster]

         Arnold was, in fact, in a bellicose vein. --W. Irving.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bellicose
    adj 1: having or showing a ready disposition to fight;
           "bellicose young officers"; "a combative impulse"; "a
           contentious nature" [syn: battleful, bellicose,
           combative]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "bellicose":
   aggressive, antagonistic, assertive, battling, belligerent,
   bickering, bloodthirsty, bloody, bloody-minded, chauvinist,
   chauvinistic, combative, contentious, disputatious, divisive,
   enemy, eristic, factional, factious, ferocious, fierce, fighting,
   full of fight, hawkish, hostile, inimical, irascible, irritable,
   jingo, jingoish, jingoist, jingoistic, litigious, martial,
   militant, militaristic, military, offensive, partisan, polarizing,
   polemic, pugnacious, quarrelsome, rebellious, saber-rattling,
   sanguinary, sanguineous, savage, scrappy, shrewish, soldierlike,
   soldierly, trigger-happy, truculent, unfriendly, unpacific,
   unpeaceable, unpeaceful, warlike, warmongering, warring,
   wrangling