The Collaborative International Dictionary of English v.0.48:

Inhibitory \In*hib"i*to*ry\, a. [LL. inhibitorius: cf. F.
   inhibitoire.]
   Of or pertaining to, or producing, inhibition; consisting in
   inhibition; tending or serving to inhibit; as, the inhibitory
   action of the pneumogastric on the respiratory center.
   [1913 Webster]

         I would not have you consider these criticisms as
         inhibitory.                              --Lamb.
   [1913 Webster]

   Inhibitory nerves (Physiol.), those nerves which modify,
      inhibit, or suppress a motor or secretory act already in
      progress.
      [1913 Webster]