The Collaborative International Dictionary of English v.0.48:

Endeictic \En*deic"tic\, a. [Gr. ?, fr. ? to point out, show; ?
   in + ? to show.]
   Serving to show or exhibit; as, an endeictic dialogue, in the
   Platonic philosophy, is one which exhibits a specimen of
   skill. --Enfield.
   [1913 Webster]