Ob*sid"i*o*nal (?), a. [L. obsidionalis, from obsidio a siege, obsidere to besiege: cf.F. obsidional. See Obsess.]
Of or pertaining to a siege.
Obsidional crown Rom.Antiq., a crown bestowed upon a general who raised the siege of a beleaguered place, or upon one who held out against a siege.
© Webster 1913.