The Collaborative International Dictionary of English v.0.48:

Indicatory \In"di*ca*to*ry\ (?; 277), a.
   Serving to show or make known; showing; indicative;
   signifying; implying.
   [1913 Webster]

WordNet (r) 3.0 (2006):

indicatory
    adj 1: (usually followed by `of') pointing out or revealing
           clearly; "actions indicative of fear" [syn: indicative,
           indicatory, revelatory, significative,
           suggestive]