knapskull means synonym of knapscall (“a type of helmet generally worn by a low-ranking person, possibly a servant of a cavalryman”). Lexicurio rates it Sui generis — a strength score of 89 out of 100.
Etymology
A variant of knapscall; the first element is possibly knape (“(UK, dialectal, obsolete) lad”), while the second element is unknown.
noun
- Synonym of knapscall (“a type of helmet generally worn by a low-ranking person, possibly a servant of a cavalryman”).