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atomic energy the energy that is released by atoms in nuclear reactions. [2 definitions]
fallout the radioactive particles that fall from a nuclear explosion.
fusion a reaction that combines the nuclei of atoms to form heavier nuclei. A huge amount of energy is released during nuclear fusion. [1/4 definitions]
H-bomb a very powerful bomb that releases energy by nuclear fusion. "H-bomb" is short for hydrogen bomb.
plutonium a radioactive chemical element. Plutonium is used to produce nuclear energy. (symbol: Pu)
reactor a device in physics for starting and controlling a nuclear chain reaction; nuclear reactor. [1/2 definitions]
uranium a heavy, silver-white radioactive metal that is one of the chemical elements. It is used to produce nuclear energy. (symbol: U)