Paracelsus Syllabification: (Par·a·cel·sus)Pronunciation: /ˌparəˈselsəs/Definition of Paracelsus (circa 1493–1541), Swiss physician: born Theophrastus Phillipus Aureolus Bombastus von Hohenheim. He developed a new approach to medicine and philosophy based on observation and experience. Paracelsus in other Oxford dictionaries Definition of Paracelsus in the British & World English dictionary