Simaroubaceae si·ma·rou·baceae uncommon noun 1. chiefly tropical trees and shrubs with bitter bark having dry usually one-seeded winged fruit Synonymsfamily Simaroubaceaequassia family Related words Broader terms rosid dicot family Parts Geraniales Part of bitterwood treeSimaroubagenus AilanthusIrvingiaKirkiaPicrasmagenus Quassia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.