catholicos

noun, often capitalized
ca·​thol·​i·​cos | \kə-ˈthȯ-li-kȯs \
plural catholicoses\-​kȯ-​səz \ or catholicoi\-​ˌkȯi \

Definition of catholicos 

: a primate of certain Eastern churches and especially of the Armenian or of the Nestorian church

First Known Use of catholicos

1878, in the meaning defined above

History and Etymology for catholicos

Late Greek katholikos, from Greek, general

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The first known use of catholicos was in 1878

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