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borderline personality disorder

noun
1.
(psychiatry) a mental condition on the dividing line between a psychiatric disorder and normality characterized by impulsiveness, extreme mood swings, and often aggressiveness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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borderline personality disorder in Medicine

borderline personality disorder bor·der·line personality disorder (bôr'dər-līn')
n.
A personality disorder marked by a long-standing pattern of instability in interpersonal relationships, behavior, mood, and self-image that can interfere with social or occupational functioning or cause extreme emotional distress.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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