horehound

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Related to white horehounds: Marrubium vulgare, common horehound

hore·hound

, hoarhound (hōr-hownd),
Marrubium vulgare (family Labitae); bitter principle is marrubium, a volatile oil. A compound alleged to have expectorant properties and often found in cough drops and other patent medicines.
[O.E. hār, hoary, + hūne, herb]
Farlex Partner Medical Dictionary © Farlex 2012

horehound

(hôr′hound′)
n.
1.
a. An aromatic plant (Marrubium vulgare) in the mint family having leaves with white pubescence and numerous white flowers in axillary cymes, native to Eurasia. The leaves yield a bitter extract used in flavoring and as a cough remedy.
b. A candy or preparation flavored with this extract.
2. Any of several similar plants in the mint family, especially Ballota nigra.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.