The Collaborative International Dictionary of English v.0.48:

Psychism \Psy"chism\, n. [Cf. F. psychisme.] (Philos.)
   The doctrine of Quesne, that there is a fluid universally
   diffused, end equally animating all living beings, the
   difference in their actions being due to the difference of
   the individual organizations. --Fleming.
   [1913 Webster]