The Collaborative International Dictionary of English v.0.48:
Dialogistic \Di*al`o*gis"tic\, Dialogistical \Di*al`o*gis"tic*al\, a. [Gr. ?.] Pertaining to a dialogue; having the form or nature of a dialogue. -- Di*al`o*gis"tic*al*ly, adv. [1913 Webster]