(from the article `particle accelerator`) ( the figure.) any device that produces a beam of fast-moving, electrically charged atomic or subatomic particles. Physicists use accelerators in ... Found on http://www.britannica.com/eb/a-z/n/61
the branch of science that deals with nuclear phenomena, as radioactivity, fission, or fusion, esp. practical applications, as in industrial engineering. Found on https://www.infoplease.com/dictionary/nucleonics