Definition of monion in US English:

monion

(also munnion, monnion)

noun

rare, historical
  • A piece of armour covering either the shoulder or the whole of the upper arm.

Origin

Mid 17th century; earliest use found in Robert Loveday (1620/21–1656), translator. From French † mougnon piece of armour that covers the shoulder, † moignon, apparently a specifically application of moignon, † mougnon stump of an amputated limb.

Pronunciation

monion

/ˈmʌnjən/