D defs.my
Entry 1 sense Webster, 1913

Obsidional

· Ob·sid·i·o·nal · IPA /əbˈsɪdɪənəl/
01 a. Of or pertaining to a siege.
  1. 1.
    Of or pertaining to a siege.
Phrases & compounds
Obsidional crown — a crown bestowed upon a general who raised the siege of a beleaguered place, or upon one who held out against a siege.