Nikonian
/nɪˈkəʊnɪən/(also Niconian) Now historical
noun
A member of the Russian Orthodox Church who accepted the liturgical reforms introduced by Nikon. Compare Old Believer. Now historical.
adjective
Of or relating to Nikon or his reforms.
Origin
Mid 19th century; earliest use found in The Penny Cyclopaedia. From the name Nikon, adopted by Nikita Minin, 6th Patriarch of Moscow, who introduced wide-ranging and controversial reforms in the Russian Orthodox Church in the 1650s + -ian.