a lemon-scented plant, Collinsonia canadensis, of eastern North America, having small yellow flowers.
Origin of horse balm
An Americanism dating back to 1780–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for horse balm
Historical Examples of horse balm
Only a few days since, while out on a drive, I passed a luxuriant clump of the plant known as "horse-balm."
Horse-balm (Collinsonia), its singular shape, 136;manner of bee's approach to, 138.