noun (used with a singular verb)
- the branch of science that deals with nuclear phenomena, as radioactivity, fission, or fusion, especially practical applications, as in industrial engineering.
- (functioning as singular) the branch of physics concerned with the applications of nuclear energy
- The study of the quantum behavior of atomic nuclei, in particular of the transitions they make between discrete energy levels as they emit and give off radiation.
- Development of instruments for use in nuclear research.