| marrubium | (n) Old World aromatic herbs: horehound, Syn. genus Marrubium |
| common horehound | (n) European aromatic herb with hairy leaves and numerous white flowers in axillary cymes; leaves yield a bitter extract use medicinally and as flavoring, Syn. white horehound, Marrubium vulgare |
| Marrubium | ‖n. [ L. ] (Bot.) A genus of bitter aromatic plants, sometimes used in medicine; hoarhound. [ 1913 Webster ] |