horse balm hor·se·balm uncommon noun 1. erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States Synonymshorse balmhorseweedstonerootstone-rootrichweedstone rootCollinsonia canadensis Related words Broader terms herb Parts Collinsonia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
