Source : Webster's Revised Unabridged Dictionary (1913)

Bucentaur \Bu*cen"taur\, n. [Gr. boy^s ox + ke`ntayros centaur.]
   1. A fabulous monster, half ox, half man.

   2. [It. bucentoro.] The state barge of Venice, used by the
      doge in the ceremony of espousing the Adriatic.