Definitions of nuclear:

• adjective:   of or relating to or constituting the nucleus of an atom

  Example: "Nuclear physics"

• adjective:   of or relating to or constituting the nucleus of a cell

  Example: "Nuclear membrane"

• adjective:   constituting or like a nucleus

  Example: "Annexation of the suburban fringe by the nuclear metropolis"

• adjective:   (weapons) deriving destructive energy from the release of atomic energy

  Example: "Nuclear war"