Mid 17th century; earliest use found in Robert Gentilis (b. 1590), translator. From post-classical Latin MuscovitaMuscovite or Italian Muscovita + -er.
Definition of Muscoviter in US English:
Muscoviter
nounˈmʌskəvʌɪtə
historical
An inhabitant of Muscovy; a Muscovite.
Origin
Mid 17th century; earliest use found in Robert Gentilis (b. 1590), translator. From post-classical Latin Muscovita Muscovite or Italian Muscovita + -er.