Fermi, Enrico
From Longman Dictionary of Contemporary EnglishFermi, EnricoEnrico FermiFer‧mi, En‧ri‧co /ˈfɜːmi $ ˈfɜːr-, enˈriːkəʊ/ (1901–54) a US scientist, born in Italy, who won a Nobel prize for his work on radioactivity and produced the first controlled nuclear reaction (=a process in which the parts in the centre of an atom are rearranged to form new substances).