Terror is extreme fear, or is the use of fear, or is someone who causes extreme fear.
(noun)See terror in Webster's New World College Dictionary
noun
Origin: ME terrour < MFr terreur < L terror < terrere, to frighten < IE *ters-, to tremble (> Gr trein, to tremble, flee) < base *ter-, to wriggle
See terror in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English terrour
Origin: , from Old French terreur
Origin: , from Latin terror
Origin: , from terrēre, to frighten
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