Source : Webster's Revised Unabridged Dictionary (1913)

Horrify \Hor"ri*fy\, v. t. [imp. & p. p. {Horrified}; p. pr. &
   vb. n. {Horrifying}.] [L. horrificare. See {Horrific}.]
   To cause to feel horror; to strike or impress with horror;
   as, the sight horrified the beholders. --E. Irving.

Source : WordNet®

horrify
     v : fill with apprehension or alarm; cause to be unpleasantly
         surprised; "I was horrified at the thought of being late
         for my interview"; "The news of the executions horrified
         us" [syn: {dismay}, {alarm}, {appal}, {appall}]
     [also: {horrified}]