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==Science and technology== ===Medicine=== * [[Paleolithic diet]], a diet based on presumed ancient diets * [[Panic disorder]], a condition with excessive fear or anxiety * [[Parkinson's disease]], a degenerative neurological condition * [[Paroxysmal dyskinesia]], a group of movement disorders * [[Pediatric dentistry]], mouth health care and tooth repair for children * [[Peritoneal dialysis]], a way to filter the blood when the kidneys are not working well * [[Personality disorder]], any of various psychiatric problems * [[Peyronie's disease]], a connective tissue disorder involving the growth of fibrous plaques in the soft tissue of the penis * [[Pharmacodynamics]], the study of how a drug affects an organism * [[Phenyldichloroarsine]], a blister agent and vomiting agent * [[Polydipsia]], excessive thirst * [[Progressive disease]], a disease that continues to worsen and often has no proven total cure * [[Psychotic depression]], a major depressive episode that is accompanied by psychotic symptoms * [[Pupillary distance]], in optometry ===Computing=== * [[pandas (software)]], function package for statistical analysis in the Python programming language * [[Pentium D]], a dual-core variant of the Pentium 4 processor * [[Perfect Dark (P2P)]], a Japanese peer-to-peer file-sharing (P2P) application designed for use with Microsoft Windows * [[Phase-change Dual]], an optical media format * [[Pure Data]], a graphical audio-processing language * [[USB PD]] (USB Power Delivery), an extension of the USB standard ===Physics=== * [[Photodiode]], a semiconductor device that converts light into current * [[Potential difference]], or voltage * [[Partial discharge]], an undesirable discharge phenomenon in high voltage dielectrics ===Other uses in science and technology=== * [[PD resistor]], a pull-down resistor * [[Pd test]], the outcome of using a drop of para-phenylenediamine (also abbr. "Pd") to identify lichens * [[Palladium]], symbol Pd, a chemical element * Photodisinfection, an alternative name for [[Antimicrobial Photodynamic Therapy]] * [[Point-defence]], a category of weapons * [[Axiom of projective determinacy]], in mathematical logic * [[Pumpe Dรผse]], a Volkswagen Group name for Unit Injector diesel engine technology
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