We don't have synonyms for vervelle yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are verville, cervelle and volvelle.
(n) :
(historical) A rivet containing a hole, or a staple, on a medieval helmet, by which a camail was attached (or rarely, on another piece of armor, by which e.g. a lance rest was attached).
(n) :
(historical) A rivet containing a hole, or a staple, on a medieval helmet, by which a camail was attached (or rarely, on another piece of armor, by which e.g. a lance rest was attached).