Etymology
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greave (n.)

"metal armor to protect the front of the leg below the knee," 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."]

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Definitions of greave

greave (n.)
armor plate that protects legs below the knee;
Synonyms: jambeau
From wordnet.princeton.edu