Per-spi-ra´tion (L. perspi´ro, to breathe through). The sweat, or watery exhalation of the skin; when visible, it is called sensible perspiration, when invisible, it is called insensible perspiration.
Pe´trous (Gr. πέτρα, petra, a rock). The name of the hard portion of the temporal bone, in which is situated the drum of the ear and labyrinth.
Phar´ynx (Gr. φάρυγξ, pharunx, the throat). The cavity between the back of the mouth and gullet.
Phys-i-ol´o-gy (Gr. φύσις, phusis, nature, and λόγος, logos, a discourse). The science of the functions of living, organized beings.
Pi´a Ma´ter (L.). Literally, the tender mother; the innermost of the three coverings of the brain. It is thin and delicate; hence the name.
Pleu´ra (Gr. πλευρά, a rib). A membrane covering the lung and lining the chest. There is one for each lung.
Pleu´ri-sy. An inflammation affecting the pleura.
Pneu-mo-gas´tric (Gr. πνεύμων, pneumon, the lungs, and γαστήρ, gaster, the stomach). The name of a nerve distributed to the lungs and stomach; it is the principal nerve of respiration.
Pneu-mo´nia (Gr.). An inflammation affecting the air-cells of the lungs.