reasonist

from The Collaborative International Dictionary of English v.0.48

Reasonist \Rea"son*ist\, n.
   A rationalist. [Obs.]
   [1913 Webster]

         Such persons are now commonly called "reasonists" and
         "rationalists," to distinguish them from true reasoners
         and rational inquirers.                  --Waterland.
   [1913 Webster]