Kern, Jerome Syllabification: (Kern, Jerome)Pronunciation: /kərn/Definition of Kern, Jerome (1885–1945), US composer; full name Jerome David Kern. A major influence in the development of the musical, he wrote several musical comedies, including Showboat (1927), which featured the song “Ol' Man River.”. Kern, Jerome in other Oxford dictionaries Definition of Kern, Jerome in the British & World English dictionary