Pronunciation: (hôr'hound", hōr'-),[key] —n. 1. an Old World plant, Marrubium vulgare, of the mint family, having downy leaves and small, whitish flowers, and containing a bitter, medicinal juice that is used as an expectorant, vermifuge, and laxative.
2. any of various plants of the mint family.
3. a brittle candy or lozenge flavored with horehound extract. Also,hoarhound.