Parenchyma. The mass or principal part of organs like the lungs or liver.

Parietal. Relating to the walls.

Paroxysm. An exacerbation of severity, in a disorder.

Parturition. Delivery; the act of bringing forth.

Pathology. The science which treats of the nature of disease.

Pectoral. Pertaining to the chest or breast.

Pediluvium. A foot bath.

Pelvis. The bony structure of the lower extremity of the body.

Percussion. The act of striking on a body to elicit sounds.

Perineum. The space between the tuberosities of the ischium, the anus, and the genitals.