The Collaborative International Dictionary of English v.0.48:

Docimastic \Doc`i*mas"tic\, a. [Gr. ?: cf. F. docimastique.]
   Proving by experiments or tests.
   [1913 Webster]

   Docimastic art, metallurgy, or the art of assaying metals;
      the art of separating metals from foreign matters, and
      determining the nature and quantity of metallic substances
      contained in any ore or mineral.
      [1913 Webster]