Source : Webster's Revised Unabridged Dictionary (1913)

Biodynamics \Bi`o*dy*nam"ics\, n.
   The branch of biology which treats of the active vital
   phenomena of organisms; -- opposed to {biostatics}.

Biodynamics \Bi`o*dy*nam"ics\, n. [Gr. ? life + E. dynamics.]
   (Biol.)
   The doctrine of vital forces or energy.