PMLD

Pelizaeus-Merzbacher-like disease.

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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.

Pneumatic larynx
A device that uses air to produce sound, helping a person whose larynx has been removed to talk.
Pneumo-
Prefix pertaining to breathing, respiration, the lungs, pneumonia, or air.