| NPD | narcissistic personality disorder; natriuretic plasma dialysate; negative pressure device; Niemann-P... |
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| OCD | obsessive compulsive disorder; Office of Child Development; Office of Civil Defense; osteochondritis... |
| OCPD | obsessive compulsive personality disorder |
| ODD | oculodentodigital [dysplasia]; oppositional defiant disorder |
| OMD | ocular muscle dystrophy; oculomandibulodyscephaly; organic mental disorder; oromandibular dystonia |
| isolated explosive disorder | A disorder of impulse control characterised by a single episode of failure to resist a violent, externally directed act which had serious impact on others. (05 Mar 2000) |
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| obsessive-compulsive disorder | An anxiety disorder characterised by recurrent, persistent obsessions or compulsions. Obsessions are the intrusive ideas, thoughts, or images that are experienced as senseless or repugnant. Compulsions are repetitive and seemingly purposeful behaviour which the individual generally recognises as senseless and from which the individual does not derive pleasure although it may provide a release from tension. (12 Dec 1998) |
| obsessive-compulsive personality disorder | A psychological disorder with a pervasive pattern of inflexible perfectionism which begins by early adulthood as indicated by many of the following symptoms: an unattainable perfectionism with overly strict standards which often make it impossible to complete a task; preoccupation with details, rules, lists, order, organization, or scheduling to the extent that the major point of the activity is lost; unreasonable insistence that others submit to exactly his or her way of doing things; an unnecessary, excessive devotion to work and productivity to the exclusion of leisure activities and friendships; rumination to the point of indecisiveness; (6) overconscientiousness about matters of morality, ethics, or values; (7) restricted expression of affection; (8) lack of generosity in giving time, money, or gifts when no personal gain is likely to result; and (9) an inability to discard worn-out or worthless objects even when they have no sentimental value. Synonym: obsessional neurosis. (05 Mar 2000) |
| oppositional disorder | A mental disorder of childhood or adolescence marked by a pattern of disobedient, negativistic, and provocative opposition to authority figures. (05 Mar 2000) |
| organic mental disorder | A psychological, cognitive, or behavioural abnormality associated with transient or permanent dysfunction of the brain, usually characterised by the presence of an organic mental syndrome. (05 Mar 2000) |
| overanxious disorder | A mental disorder of childhood or adolescence marked by excessive worrying and fearful behaviour not related specifically to separation or due to recent stress. (05 Mar 2000) |
| thought process disorder | An intellectual function symptom of schizophrenia, manifested by irrelevance and incoherence of verbal productions ranging from simple blocking and mild circumstantiality to total loosening of associations. (05 Mar 2000) |
| tobacco use disorder | Tobacco used to the detriment of a person's health or social functioning. Tobacco dependence is included. (12 Dec 1998) |
| emotional disorder | See: mental illness, behaviour disorder. (05 Mar 2000) |
| erotomanic type of paranoid disorder | The false belief that one is loved by another such as a movie star or a casual acquaintance. (05 Mar 2000) |
| jealous type of paranoid disorder | The false belief that one's spouse or lover is unfaithful and leading to repeated confrontation, or the taking of extraordinary steps to intervene in the imagined infidelity. (05 Mar 2000) |
| factitious disorder | A mental disorder in which the individual intentionally produces symptoms of illness or feigns illness for psychological reasons rather than for environmental goals. (05 Mar 2000) |
| familial bipolar mood disorder | <psychiatry> Bipolar mood disorder commonly inherited as an autosomal dominant trait and also occasionally as an X-linked one. (05 Mar 2000) |
| kinky-hair disorder | Kinky hair disease, congenital defect of copper metabolism manifested in short, sparse, poorly pigmented kinky hair; associated with failure to thrive, physical and mental retardation, and progressive severe deterioration of the brain; apparently a defect of copper transport; X-linked recessive inheritance. Synonym: kinky-hair disorder, Menkes' syndrome, trichopoliodystrophy. (05 Mar 2000) |
| late luteal phase dysphoric disorder | <syndrome> A combination of emotional, physical, psychological, and mood disturbances that occur after ovulation and normally end with the onset of the menstrual flow. (12 Dec 1998) |