Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Christus, i, m., = Χριστός (the Anointed, Heb. [??]; cf. Lact. 4, 7, 7), Christ, Tac. A. 15, 44 Rupert. ad loc.; Plin. Ep. 10, 97; and in the Church fathers very freq.