The Collaborative International Dictionary of English v.0.48:

Elaborative \E*lab"o*ra*tive\, a.
   Serving or tending to elaborate; constructing with labor and
   minute attention to details.
   [1913 Webster]

   Elaborative faculty (Metaph.), the intellectual power of
      discerning relations and of viewing objects by means of,
      or in, relations; the discursive faculty; thought.
      [1913 Webster]