A personality disorder characterized by frequently alternating periods of elation and depression, usually occurring spontaneously and not related to external circumstances.
Are You Weird? Personality Idioms ExploredRead more in this article about some frequently asked questions and fun facts related to our definitions.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.