A piece of armor protecting only half the forearm, or a reduced form of arm protection used in medieval and Renaissance warfare.
From 'demi-' (half) plus 'vambrace' (from Old French 'avant-bras' meaning forearm). A specialized military equipment term from the 15th-16th centuries.
A demivambrace was a clever medieval compromise—full arm armor was heavy and restrictive, but leaving your forearm completely exposed meant risking nasty sword cuts, so half-protection became popular with soldiers who needed mobility!
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