Apocynaceae apo·cy·na·ceae uncommon noun 1. chiefly tropical trees or shrubs or herbs having milky juice and often showy flowers; many are sources of drugs Synonymsfamily Apocynaceaedogbane family Related words Broader terms dicot family Parts Gentianales Part of ApocynumAcocantheraAdeniumgenus AllamandaAlstoniaAmsoniaBeaumontiagenus Carissa WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.