Definition of "Sullivan" :

noun: English composer of operettas who collaborated with the librettist William Gilbert (1842-1900)

noun: United States educator who was the teacher and lifelong companion of Helen Keller (1866-1936)

noun: United States host on a well known television variety show (1902-1974)

noun: United States psychiatrist (1892-1949)

noun: United States architect known for his steel framed skyscrapers and for coining the phrase form follows function' (1856-1924)