Unhelm is a related term of dishelm.
As verbs the difference between unhelm and dishelm
is that unhelm is to remove the helm from while dishelm is (poetic) to deprive of a helmet.
dishelm
English
Verb
(
en verb)
(poetic) To deprive of a helmet.
- Lying stark, dishelmed and mute, and motionlessly pale. — Tennyson.