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Webster 1913 Edition

Noun.

One who conforms to or inculcates Judaism;

specifically,

pl.

(Ch. Hist.)

those Jews who accepted Christianity but still adhered to the law of Moses and worshiped in the temple at Jerusalem.

Noun.

One who conforms to the religion of the Jews.

Judaizer ‎(plural Judaizers)

(archaic) One who conforms to or inculcates Judaism.
(historical) One of the Jews who accepted Christianity but still adhered to the law of Moses and worshipped in the temple at Jerusalem.