ebionite

from The Century Dictionary.

• noun A member of a party of Judaizing Christians which appeared in the church as early as the second century and disappeared about the fourth century.
• Relating to the heresy of the Ebionites.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Eccl. Hist.) One of a sect of heretics, in the first centuries of the church, whose doctrine was a mixture of Judaism and Christianity. They denied the divinity of Christ, regarding him as an inspired messenger, and rejected much of the New Testament.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a member of a group of Jews who (during the early history of the Christian Church) accepted Jesus as the Messiah; they accepted the Gospel According to Matthew but rejected the Epistles of St. Paul and continued to follow Jewish law and celebrate Jewish holidays; they were later declared heretic by the Church of Rome
• adjective of or relating to the Ebionites or their religion