The Collaborative International Dictionary
Proselytizer \Pros"e*ly*ti`zer\, n. One who proselytes.
Douglas Harper's Etymology Dictionary
1811, agent noun from proselytize.
Wiktionary
n. agent noun of proselytize; one who proselytizes.
Usage examples of "proselytizer".
Inquisitor chose for his assistant was the principal proselytizer of the Toltecan heresy.
For every proselytizer stalking the streets and spaceports of the thousand human Com Worlds, there were five working in the poorest communities, feeding, clothing, sheltering those in need with no questions asked and displaying no prejudices of any sort.
Because they were rabid proselytizers the Catechists accepted - even, stories insisted, encouraged - such travelers.
But, though he was as much a fanatic proselytizer as the others, he was the only one who treated me as someone, not just another piece of meat for the Catechists to mold.