Wordnet 3.0
NOUN (2)
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; 
The Collaborative International Dictionary of English v.0.48:
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.
   [1913 Webster]
WordNet (r) 3.0 (2006):
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