(US, military) Initialism of post exchange. The U.S. Army's Post Exchange. / Abbreviation of peroxidase.

(computing) Abbreviation of pixels.

(medicine) Abbreviation of prognosis. / (medicine) Abbreviation of physical examination. / (medicine) Abbreviation of pain. / Abbreviation of peroxidase.

Initialism of powder X-ray diffraction.

(physics) Initialism of parametric X-ray radiation, X-ray radiation emitted when relativistic charged particles, like electrons, interact with crystals. Originally predicted by the Soviet scientists Vladimir G. Baryshevsky and Ilya D. Feranchuk.

plural of PX

(pathology) Initialism of pseudoxanthoma elasticum.

Someone who suffers from pseudoxanthoma elasticum.