Armet

noun

1. A late-medieval light helmet with a neck guard and movable visor.
2. The most complete and perfect defensive head-covering of the middle ages, introduced about 1450, and remaining in use until the abandonment of the closed headpiece, more than a century later.
3. A kind of helmet worn in the 14th, 15th, and 16th centuries.
4. A type of mediaeval full-face helmet
5. a medieval helmet with a visor and a neck guard