Source : Webster's Revised Unabridged Dictionary (1913)

Espadon \Es"pa*don\, n. [F. espadon, fr. Sp. espadon, fr. espada
   sword; or fr. It. spadone an espadon, spada sword.]
   A long, heavy, two-handed and two-edged sword, formerly used
   by Spanish foot soldiers and by executioners. --Wilhelm.