The term hypergeusia comes from the Greek prefix huper (to exceed a certain boundary) and the Latin noun gustum (taste). It refers to a " chemosensory disorder characterized by an increased taste sensitivity to some or all tastants. Hypergeusia may also be classified as a type of " hyperaesthesia. The term is used in opposition to hypogeusia. Hypergeusia is classified as a " gustatory illusion (i.e. a taste illusion) or a chemosensory disorder.
References
Ackerman, B.H., Kasbekar, N. (1997). Disturbances of taste and smell induced by drugs. Pharmacotherapy, 17, 482-496.
Schiffman, S.S., Gatlin, C.A. (1993). Clinical physiology of taste and smell. Annual Review of Nutrition, 13, 405-436.
Dictionary of Hallucinations. J.D. Blom. 2010.