noun
or hoar·hound ˈhō(ə)rˌhau̇nd, ˈhȯ(ə)r-, ˈhōəˌh-, ˈhȯ(ə)ˌh-
Etymology: by folk etymology from Middle English horhoune, from Old English hārhūne, from hār hoary + hūne horehound — more at hoar
1.
a. : a European aromatic mint ( Marrubium vulgare ) that is naturalized in the U.S., has pubescent leaves and small axillary flowers, has a very bitter taste, and is used as a tonic and anthelmintic — called also white horehound
b. : an extract or confection made from this plant and used as a remedy for coughs and colds
2. : any of several labiates resembling horehound in appearance — used with an attributive or qualifying adjective
black horehound
water horehound