The Collaborative International Dictionary of English v.0.48:

Trituration \Trit`u*ra"tion\, n. [Cf. F. trituration, L.
   trituratio a thrashing of grain.]
   The act of triturating, or reducing to a fine or impalpable
   powder by grinding, rubbing, bruising, etc. --Paley.
   [1913 Webster]