| 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 |
| 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) |
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| 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) |
| LDL receptor disorder | Abnormality in clearance of LDL from the plasma due to abnormality in LDL receptor activity; causes hypercholesterolaemia. (05 Mar 2000) |
| functional disorder | A physical disorder with no known or detectable organic basis to explain the symptoms. See: behaviour disorder, neurosis. Synonym: dynamic disease, functional disease, functional illness. (05 Mar 2000) |