Wiktionary
n. (plural of doomsday device English)
Usage examples of "doomsday devices".
On Giedi Prime and elsewhere, humans had shown themselves unwilling to unleash the doomsday devices, thus rendering the threat impotent.
One way or another, they were going to get inside, because only a crew held hostage could disable whatever doomsday devices they had deployed.
I've seen Ontongard technologyhow did Zlotnikov, a security guard with a high school diploma, figure out that they're alien doomsday devices?
They were meant as doomsday devices, never to be used -- whose mere existence should have been a sufficient deterrent against overt aggression.
So it is not one whit mysterious that we poison the water and air and topsoil, and construct ever more cunning doomsday devices, both industrial and military.
They found neither Zheng's supposed alien doomsday devices nor any leads to the cult's current location.