The Collaborative International Dictionary of English v.0.48:

Haquebut \Haque"but\ (h[a^]k"b[u^]t), n.
   See Hagbut.
   [1913 Webster] n.

   1. (Japan) suicide by self-disembowlment on a sword.

   Syn: harikari.
        [WordNet 1.5] harakiri