n. [ See Muscovy glass. ] 1. A native or inhabitant of Muscovy or ancient Russia; hence, a Russian. [ 1913 Webster ]
2. An inhabitant of Moscow. [ PJC ]
3. (Min.) Common potash mica, essentially KAl3Si3O10(OH)2. It is used as an electrical insulator. See Mica. [ 1913 Webster ]