1. A holy relic or sacred object; something held as sacred or inviolable.
Usage: archaic; chiefly historical

1. An archaic exclamation used to express surprise, emphasis, or oath-taking.
Usage: archaic; dated; chiefly British

Examples

• By halidom, I swear this is the truth!
• The knight guarded the halidom with his life.
• Halidom, what a sight that was!
• She touched the halidom and made her vow.
• The monastery kept the halidom in a sacred chamber.