The Collaborative International Dictionary of English v.0.48:

Biodynamic \Bi`o*dy*nam"ic\, Biodynamical \Bi`o*dy*nam"ic*al\,
   a.]
   1. (Biol.) Of or pertaining to biodynamics, or the doctrine
      of vital forces or energy.
      [Webster 1913 Suppl.]

   2. of or pertaining to a method of farming that uses only
      organic fertilizers (rather than chemical fertilizers) and
      organic materials for improving the soil characteristics.
      [PJC]