One who makes dire predictions about the future; one who predicts doom.

plural of doomsayer

simple past tense and past participle of doomsay

Alternative spelling of doomsday device

A hypothetical weapon (often a bomb) programmed to automatically be used in response to certain attacks, usually with very dire consequences (such as the annihilation of the world).

Third-person singular simple present indicative form of doomsay

(cosmology, astronomy) An occurrence which causes the end of the universe or which destroys the planet earth; a global cataclysm.

plural of doomer

One who believes that petroleum depletion will inevitably lead to a severe recession or depression, followed by a Malthusian catastrophe.

plural of doomsday device