hor·ror 
(hôrər, hŏr-)
(hôrər, hŏr-)n.
1.
a. An intense, painful feeling of repugnance and fear.
b. A state or condition marked by this feeling: stood in horror looking at the scene. See Synonyms at fear.
2. An intense dislike or abhorrence: had a horror of being forced to play charades at the party.
3. A cause of horror: "The creature that had seemed a horror in its box was, up close, a figure of sorrow" (Paul Theroux).
4.
a. A genre of fiction or other artistic work evoking suspense and horror, especially through the depiction of gruesome or supernatural elements.
b. A work of this genre.
5. Informal One that is unpleasant, ugly, or disagreeable: That hat is a horror.
6. horrors Informal Intense nervous depression or anxiety. Often used with the.
[Middle English horrour, from Old French horreur, from Latin horror, from horrēre, to tremble.]