Source : Webster's Revised Unabridged Dictionary (1913)

Jambes \Jambes\, Jambeux \Jam"beux\, n. pl. [From F. jambe a
   leg: cf. OF. jambiere. See {Jamb}, n.] (Ancient Armor)
   In the Middle Ages, armor for the legs below the knees.
   [Written also {giambeux}.] --Chaucer.