c.1375 "great fear," from O.Fr.
terreur (14c.), from L.
terrorem (nom.
terror) "great fear, dread," from
terrere "fill with fear, frighten," from PIE base
*tre- "shake" (see
terrible). Meaning "quality of causing dread" is attested from 1528;
terror bombing first recorded 1941, with ref. to German air attack on Rotterdam. Sense of "a person fancied as a source of terror" (often with deliberate exaggeration, as of a naughty child) is recorded from 1883. The
Reign of Terror in Fr. history (March 1793-July 1794) so called in Eng. from 1801. An O.E. word for "terror" was
broga, also
egesa.