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The Collaborative International Dictionary
Jambeux

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, usually having front and back pieces; called also greaves. [Written also giambeux.]
--Chaucer.

Wiktionary
jambeux

n. (context historical English) mediaeval armour for the legs below the knees