1. the ecclesiastical title of the leaders of the Nestorian and Armenian churches;
The Collaborative International Dictionary of English v.0.48:
Catholicos \Ca*thol"i*cos\, n. [NL. See Catholic.] (Eccl.)
The spiritual head of the Armenian church, who resides at
Etchmiadzin, Russia, and has ecclesiastical jurisdiction
over, and consecrates the holy oil for, the Armenians of
Russia, Turkey, and Persia, including the Patriarchs of
Constantinople, Jerusalem, and Sis.
Note: The Patriarch of Constantinople is the civil head of
the Armenians in Turkey.
WordNet (r) 3.0 (2006):
n 1: the ecclesiastical title of the leaders of the Nestorian
and Armenian churches