atom bomb

from the GNU version of the Collaborative International Dictionary of English.

• noun a bomb of great power in which the explosive energy is derived from the nuclear fission of a fissionable material, such as plutonium or uranium-235. It is a type of nuclear weapon. The strength of an atom bomb is measured in kilotons, i.e. the equivalent energy released by explosion of a thousand tons of TNT. The first atomic bomb was manufactured in 1945.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative form of atomic bomb.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)
• verb bomb with atomic weapons