The Collaborative International Dictionary of English v.0.48:

Falchion \Fal"chion\, n. [OE. fauchon, OF. fauchon, LL.
   f[aum]lcio, fr. L. falx, falcis, a sickle, cf. Gr. ?????? a
   ship's rib, ?????? bandy-legged; perh, akin to E. falcon; cf.
   It. falcione. Cf. Defalcation.]
   1. A broad-bladed sword, slightly curved, shorter and lighter
      than the ordinary sword; -- used in the Middle Ages.
      [1913 Webster]

   2. A name given generally and poetically to a sword,
      especially to the swords of Oriental and fabled warriors.
      [1913 Webster]

WordNet (r) 3.0 (2006):

falchion
    n 1: a short broad slightly convex medieval sword with a sharp
         point