Source : Webster's Revised Unabridged Dictionary (1913)

Iconology \I`co*nol"o*gy\, n. [Gr. ?; e'ikw`n an image + ?
   discourse: cf. F. iconologie.]
   The discussion or description of portraiture or of
   representative images. Cf. {Iconography}.

Source : WordNet®

iconology
     n : the branch of art history that studies visual images and
         their symbolic meaning (especially in social or political
         terms)