Plasma. The colorless fluid of the blood.

Plethora. Overfullness of blood; repletion.

Pleura. The serous membrane covering the lungs.

Pleuritis. Pleurisy.

Pneumogastric. Belonging to the lungs and stomach; the eighth pair of nerves.

Post Mortem. After death.

Presentation. The part that presents.

Primapara. A woman who bears her first child.

Process. A projecting part of bones.

Prognosis. A prediction as to the course and event of a disease.