A piece of armor that protects only half of the arm, covering part of the upper arm or forearm instead of the whole arm.
From 'demi-' combined with 'brassart' (also spelled 'brassard'), which comes from Old French 'bras' meaning 'arm.' Medieval armorers developed partial armor pieces for flexibility and reduced weight.
Knights didn't always wear full armor because moving in it was exhausting—a demibrassart let soldiers protect their sword-arm while keeping the other arm freer for fighting longer!
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