What does "stundist" mean?

Stundist: One of a large sect of Russian dissenters founded, about 1860, in the village of Osnova, near Odessa, by a peasant, Onishchenko, who had apparently been influenced by a German sect settled near there. They zealously practice Bible reading and reject priestly dominion and all external rites of worship. -- Stun"dism (#), n.