D defs.my
Entry 2 senses Webster, 1913

Doomsday

/do͞om'-zdāˌ/ · Dooms·day · IPA /ˈduːmz.deɪ/
01 n. A day of sentence or condemnation; day of death.
  1. 1.
    A day of sentence or condemnation; day of death.
  2. 2.
    The day of the final judgment.
    “I could not tell till doomsday.” Chaucer.
Phrases & compounds
Doomsday Book — See Domesday Book.