[Ang.-Sax., mearg, mearh.] marrubin (mar-ru'bin)

A bitter principle obtained from Marrubium vulgare. Marrubium (mar-ru'be-um). Syn.: herb a marrubii (2d def.). 1. A genus of labiate plant. 2. Of the U. S. Ph., the leaves and flowering tops of M. vulgare. M. vulgare. White horehound. The herb contains a volatile oil, tannin, resin, and a bitter principle marrubin. It is a mild tonic and laxative and a diuretic in large doses. marsh gas. See methane. marshmallow (marsh'mal-o). See Althea. Marsh's test. A very sensitive test for arsenic or antimony with the aid of the specially constructed Marsh apparatus. The arsenic and antimony compounds are converted into ars in and stibine which are easily detected by certain chemical tests. [James Marsh, English chemist, 1794-1846.] marsupial i zati on shun). The formation (mar-su"pe-al-iz-a'- of a pouch or a pouch like cavity. [Lat., marsupium, pouch.] mars up i on, marsupium (mar-su'pe-on, mar-su'pe-um). A pouch or bag, or a pouch like structure, m. cerebelli. The posterior transverse fi ure of the brain. m. cerebri anterius. The anterior transverse fi ure of the brain, m. cerebri poster i us. The posterior transverse fi ure of the brain. [Gr., marsipionx from marsipos, a bag.] marsyle (mar's il). Iron cacodyl ate. martial (mar's hal). See ferruginous.