The Collaborative International Dictionary of English v.0.48:

Desinential \Des`i*nen"tial\, a. [Cf. F. d['e]sinentiel.]
   Terminal.
   [1913 Webster]

         Furthermore, b, as a desinential element, has a dynamic
         function.                                --Fitzed.
                                                  Hall.
   [1913 Webster]