1
[Theodosius †about 538 a.d. patriarch of Alexandria + English -an, noun suffix]
: a follower of Theodosius of Alexandria the leader of the Monophysites in the 6th century
2
[Theodosius, 16th century Russian monk + English -an, noun suffix]
: a follower of the Russian monk Theodosius who preached in Lithuania in 1525 against idolatry and founded a sect practicing prayer for purification of articles acquired from unbelievers
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Merriam-Webster unabridged