Definition

dys·reg·u·la·tion

Pronunciation: dis-ˌreg-yə-ˈlā-shən 

Function: n  

Definition: ~ impairment of a physiological regulatory mechanism (as that governing metabolism, immune response, or organ function)

Merriam-Webster's Medical Dictionary, © 2007 Merriam-Webster, Inc.

Source: http://dictionary.reference.com/browse/dysregulation