The Collaborative International Dictionary of English v.0.48:

Zetetic \Ze*tet"ic\, a. [Gr. ?, fr. ? to seek: cf. F.
   z['e]t['e]tique.]
   Seeking; proceeding by inquiry.
   [1913 Webster]

   Zetetic method (Math.), the method used for finding the
      value of unknown quantities by direct search, in
      investigation, or in the solution of problems. [R.]
      --Hutton.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Zetetic \Ze*tet"ic\, n.
   A seeker; -- a name adopted by some of the Pyrrhonists.
   [1913 Webster]