The scientific study of people whose thoughts and behavior deviate from accepted norms to such an extent that participation in and adaptation to normal situations is compromised.
Example: A college student relies heavily on the American Psychiatric Association’s Diagnostic and Statistical Manual (DSM) of psychological disorders when she studies for her Abnormal Psychology course.
Grinnell, R. (2008). Abnormal Psychology. Psych Central. Retrieved on May 22, 2015, from http://psychcentral.com/encyclopedia/2008/abnormal-psychology/