PMDD

Premenstrual dysphoric disorder.

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PML
Stands for progressive multifocal leukoencephalopathy, a rapidly progressive, often fatal viral infection of the brain. Commonly abbreviated as PML. PML is believed to be due to the Jacob-Creutzfeldt (JC) papovavirus. The virus infects oligodendrocytes (support cells in the brain). The signs and symptoms of PML include headaches, memory loss, changes in mental status, speech and […]
PMLD
Pelizaeus-Merzbacher-like disease.
PMR (polymyalgia rheumatica)
A disorder of the muscles and joints of older persons characterized by pain and stiffness, affecting both sides of the body, and involving the shoulders, arms, neck, and buttock areas.

PNET
Ewing tumor of bone; extraosseus Ewing tumor (tumor growing outside of the bone); primitive neuroectodermal tumor (PNET), also known as peripheral neuroepithelioma; and Askin tumor (PNET of the chest wall).
Pneuma
The life-giving principle. According to the school of medicine in ancient Alexandria, life was associated with a vapor called the pneuma. The belief in pneuma was called pneumatism. In hindsight, pneumatism was an early attempt to explain respiration which is, indeed, the life-giving principle.