Source : Webster's Revised Unabridged Dictionary (1913)

Christology \Chris*tol"o*gy\, n. [Crist + -logy.]
   A treatise on Christ; that department of theology which
   treats of the personality, attributes, or life of Christ.

Source : WordNet®

Christology
     n 1: a religious doctrine or theory based on Jesus or Jesus'
          teachings
     2: the branch of theology concerned with the person and
        attributes and deeds of Christ