The Collaborative International Dictionary of English v.0.48:

Analogism \A*nal"o*gism\, n. [Gr. ? course of reasoning, fr. ?
   to think over, to calculate]
   1. (Logic) an argument from the cause to the effect; an a
      priori argument. --Johnson.
      [1913 Webster]

   2. Investigation of things by the analogy they bear to each
      other. --Crabb.
      [1913 Webster]