Merriam-Webster Collegiate Dictionary - frenzy

 I. noun  (plural frenzies)  Etymology: Middle English frenesie, from Middle French, from Medieval Latin phrenesia, alteration of Latin phrenesis, from phreneticus  Date: 14th century  1.  a. a temporary madness  b. a violent mental or emotional agitation  2. intense usually wild and often disorderly compulsive or agitated activity a shopping ~  II. transitive verb  (frenzied; ~ing)  Date: 1791 to affect with ~