Avicennia avi·cen·nia uncommon noun 1. small genus of tropical shrubs or trees Synonymsgenus Avicennia Related words Word family AvicenniaceaeAvicennia marinaAvicennia officinalis Broader terms asterid dicot genus Parts Verbenaceae Part of black mangrovewhite mangrove WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.