Bryant, William Cullen Syllabification: (Bry·ant, William Cullen)Pronunciation: /ˈbrīənt/Definition of Bryant, William Cullen (1794–1878), US poet and editor. He was co-owner and editor of the New York Evening Post 1829–78; his poems “Thanatopsis” (1811) and “To a Waterfowl” (1821) established him as the leading poet of his time.