Noun: upper cannon
- (medieval armour) the plate armour protecting the upper arm between shoulder and elbow
"The knight's upper cannon deflected the sword blow";
- rerebrace [archaic]
Derived forms: upper cannons
Type of: cannon
Part of: body armor [US], body armour [Brit, Cdn], cataphract, coat of mail, suit of armor [US], suit of armour [Brit, Cdn]