To form scar tissue or heal into a scar (British spelling variant).
British English spelling of cicatrize, maintaining the -s- following French conventions while retaining the Italian/Latin root.
The survival of both -z- and -s- spellings reflects England's historical language choices—retaining French spelling conventions even as American English moved toward Germanicized -z- endings.
Complete word intelligence in one call. Free tier — 50 lookups/day.