Source : Webster's Revised Unabridged Dictionary (1913)

Prohibitory \Pro*hib"it*o*ry\, a. [L. prohibitorius.]
   Tending to prohibit, forbid, or exclude; implying
   prohibition; forbidding; as, a prohibitory law; a prohibitory
   price.

Source : WordNet®

prohibitory
     adj : tending to discourage (especially of prices); "the price was
           prohibitive" [syn: {prohibitive}]