Is it farther or further?
leg armor, c.1300, from Old French greve "shin, armor for the leg" (12c.), of unknown origin. [Klein suggests it ultimately is from Egyptian Arabic gaurab "stocking, apparel for the leg."]
only in 1 Sam. 17:6, a piece of defensive armour (q.v.) reaching from the foot to the knee; from French greve, "the shin." They were the Roman cothurni.