Also, heaume.Also called great helm.a medieval helmet, typically formed as a single cylindrical piece with a flat or raised top, completely enclosing the head.
2.
Archaic. a helmet.
–verb (used with object)
3.
to furnish or cover with a helmet.
Origin: bef. 900; ME, OE; c. D, G helm; akin to OE helan to cover. See hull1