Alliaria al·lia·ria uncommon noun 1. a genus of herbs of the family Cruciferae; have broad leaves and whit flowers and long siliques Synonymsgenus Alliaria Related words Word family Alliaria officinalis Broader terms dilleniid dicot genus Parts Cruciferae Part of garlic mustard WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.