marrŭbĭum, ii, n.,
the plant horehound : marrubium quod Graeci prasion vocant, alii linostrophon, nonnulli philopaeda, aut philochares, Plin. 20, 22, 89, § 241; 14, 16, 19, § 105; Col. 10, 356.
MARRU´BIUM[MARRUVIUM] ...
Dictionary of Greek and Roman Geography
·noun A genus of bitter aromatic plants, sometimes used in medicine; hoarhound. ...
Webster's Dictionary of the English Language