LATIN DICTIONARYLexicon Latīnum
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“horror” in Latin

The English word horror itself goes back to Latin horreō, through horror.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

horror
Shivering, shuddering, horror (i. e., ubi totum corpus intremit, Cels.).
Dread, extreme fear, horror (cold trembling, from fear; Cic.): terror, of anything, alicujus rei. Horror seizes anybody, horror perfundit aliquem (Cic.); horror subit alicujus animum; terror mihi incidit or me invadit.
Extreme aversion, aversatio, of anything, alicujus rei (Silver Age): detestatio (of anything, alicujus rei, in Gell.; the connection does not occur in Cic. in this sense): animus aversissimus ab aliquo (a very great horror of anybody): to have a horror of anything, detestari aliquid: to have a horror of anybody, abhorrere aliquem; animo esse aversissimo ab aliquo.
Horrible action, res nefanda or infanda: res atrox or nefaria: tragoediae (tragic occurrences; ☞ Cic., Mil., 7, 18). The horrors of war, belli vastatio: to perpetrate and suffer unutterable horrors, facere et pati infanda.

Quick answer

What is the Latin word for horror?
The usual Latin words for “horror” are horror, terror, āversātĭo; also dētestātiō, īnfandus, nefārius. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.