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Any of several strongly aromatic, eastern North American plants of the genus Collinsonia of the mint family, having opposite leaves, square stems, and axillary clusters of lemon-scented yellow flowers.
[From its former use for treating ailments of horses .]
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|Noun||1.||horse balm - erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States|
herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests