couter
A piece of armor which covers the elbow.
historical
Helmets should be started in 10 or 12 gauge, couters and knees in 14 gauge.
Where it comes from
From Middle English couter, said to be from an Anglo-French variant couter, cuter of continental French coudière, from coute (“elbow”).
Adapted from the Wiktionary entry couter (CC BY-SA 4.0).