gisarm

from The Collaborative International Dictionary of English v.0.48

Gisarm \Gis*arm"\ (j[i^]s*[aum]rm"), n. [OF. gisarme, guisarme.]
   (Medi[ae]val Armor)
   A weapon with a scythe-shaped blade, and a separate long
   sharp point, mounted on a long staff and carried by foot
   soldiers.
   [1913 Webster]