4 occurrences in 4 dictionaries
Reference: Greaves
Easton
only in 1Sa 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.
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Hastings
Morish
SEE ARMOUR.
Smith
Greaves.
a piece of defensive armor which reached from the foot to the knee and thus protected the shin of the wearer. It was made of leather or brass.