-ˌīzə(r) noun
( -s )
Usage: usually capitalized
1. : a Jewish Christian of the apostolic age who attempted to enforce conformity by all Christians to the precepts and practices of Judaism
the Judaizers … thought that Gentiles, in order to be Christians, should be circumcised — J.W.Hunkin
2. : a member of an heretical group arising in the Russian Orthodox Church in the 15th century and favoring an increased emphasis upon the doctrines and rituals of Judaism
the Judaizers conducted a campaign of subversive activity within the church — Serge Bolshakoff