The Collaborative International Dictionary of English v.0.48:

Parisology \Par`i*sol"o*gy\, n. [Gr. ? almost equal, evenly
   balanced + -logy.]
   The use of equivocal or ambiguous words. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

parisology
    n 1: the use of ambiguous words