viburnum /vɪˈbɜː(ɹ)nəm/ noun1 •Any of many shrubs and trees, of the genus Viburnum, native to the Northern Hemisphere that have showy clusters of flowers.Thus he discovered two or three kinds of oaks, a few viburna, and some trees of the maple genus, with a wild sort of Japanese pear. — 1797 formsviburna · viburnums