The Collaborative International Dictionary of English v.0.48:

Speculatory \Spec"u*la*to*ry\ (sp[e^]k"[-u]*l[.a]*t[-o]*r[y^]),
   a. [L. speculatorius belonging to spies or scouts.]
   1. Intended or adapted for viewing or espying; having
      oversight. --T. Warton.
      [1913 Webster]

   2. Exercising speculation; speculative. --T. Carew.
      [1913 Webster]