O ‧ nas ‧ sis, Aristotle /əʊˈnæsəs, əʊˈnæsɪs, ˈærəstɒtl $ -tɑːtl/ BrE AmE
(1906–75) a Greek ship owner, known for being extremely rich, who married Jackie ↑ Kennedy , the ↑ widow of US President John F. ↑ Kennedy , in 1968. Before that he had a long relationship with Maria ↑ Callas .