The Collaborative International Dictionary
Obsidional
Obsidional \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.
Wiktionary
obsidional
a. Pertaining to a siege.
Usage examples of "obsidional".
I spoke at once upon the impulse of the moment, with a sense of reckless desperation not unlike that with which an artillerist fires the train whose explosion may win for him the obsidional wreath or blow him into atoms.