D defs.my
Entry 2 senses Webster, 1913

Halidom

/(hăl"ĭ*dŭm)/ · Hal·i·dom · IPA /ˈhælɪdəm/
01 n. Holiness; sanctity; sacred oath; sacred things; sanctuary; -- used chiefly in oaths.
  1. 1.
    Holiness; sanctity; sacred oath; sacred things; sanctuary; -- used chiefly in oaths.[Archaic]
    “So God me help and halidom.” — Piers Plowman.
    “By my halidom, I was fast asleep.” Shak.
  2. 2.
    Holy doom; the Last Day.[R.]