A Muscovite is a person from Moscow, the capital of Russia. You can also use it as an adjective: Muscovite streets, a Muscovite accent. It sounds a little formal or bookish; in ordinary conversation people more often say someone from Moscow. The word comes from Latin Moscovita, from Moscovia or Muscovy — the old English name for the Russian land around Moscow — plus an ending that means a person from that place. Capital M. Older English used Muscovy where we would now say Russia, so in old books Muscovite can mean a Russian in a wider sense; today it points to Moscow. Though actually there is also muscovite with a small m, a shiny mineral (a kind of mica) — that is a different word that happens to look the same.