obsidional
adjective
ob·sid·i·o·nal
əbˈsīdē‧ənəl
1
: of or relating to a siege
2
of a piece of money : issued for use during a siege
obsidional coins
Word History
Etymology
Latin obsidionalis, from obsidion-, obsidio siege (from obsidēre to besiege + -ion-, -io -ion) + -alis -al