Word Origin & History
atrocity1530s, from L. atrocitatem (nom. atrocitas) "cruelty," noun of quality from atrox "fierce, cruel, frightful," from PIE *atro-ek-, from base *ater- "fire" + *okw- "see," thus "of fiery or threatening appearance." The noun meaning "an atrocious deed" is from 1793.