an agreement signed by Britain, the Soviet Union, and the U.S. in 1963, committing nations to halt atmospheric tests of nuclear weapons: by the end of 1963, 96 additional nations had signed the treaty.
- Nuclear testing
The testing of nuclear weapons. (See Nuclear Test Ban Treaty.) The testing of atomic bombs by exploding them either above or below ground. (See Nuclear Test Ban Treaty.)
- Nuclear threshold
noun 1. the point in war at which a combatant brings nuclear weapons into use noun the point during a conflict or war at which the use of nuclear weapons is chosen
- Nuclear umbrella
noun the nuclear weapons of one country seen as protection for its allies
noun 1. a warhead containing a fission or fusion bomb.