dogbane Syllabification: (dog·bane)Pronunciation: /ˈdôgˌbān/Definition of dogbane noun a shrubby North American plant, typically having bell-shaped flowers and reputed to be poisonous to dogs. Genus Apocynum, family Apocynaceae: several species, including the common spreading dogbane (A. androsaemifolium) dogbane in other Oxford dictionaries Definition of dogbane in the British & World English dictionary