All articles starting with P

Persicaria hydropiper

Persicaria hydropiper (water-pepper, marshpepper knotweed), Polygonaceae annual of wet ground, native temperate Eurasia, pungent from polygodial drimane sesquiterpenes; used as spice, medicine, poison; IUCN least concern.

Persicaria maculosa

Persicaria maculosa (spotted ladysthumb, redshank, lady's thumb; formerly Polygonum persicaria) is an annual Polygonaceae herb native to temperate Eurasia, a weed of spring crops with dark-blotched leaves and pink flower spikes, used as poison and medicine.

Persicaria odorata

Persicaria odorata, known as Vietnamese coriander or rau răm, is a perennial herb of the buckwheat family native to Southeast Asia, whose pungent, coriander-like leaves flavor laksa, salads, and laab.

Persija Jakarta

Persija Jakarta, founded 28 November 1928 as Voetballbond Indonesia Jacatra (VIJ), is Jakarta's professional football club, nicknamed Macan Kemayoran; 11 national titles, owned by PT Persija Jaya Jakarta (Nirwan Bakrie), home at Jakarta International Stadium, supporters The Jakmania.

Persil

Persil, sold as Dixan in some markets, is a laundry detergent brand launched in 1907 by Henkel, described as the world's first self-acting detergent; Unilever sells Persil in the United Kingdom.

Persimmon

The persimmon (Diospyros kaki), also called the Japanese or kaki persimmon, is a deciduous fruit tree native to China and the most cultivated persimmon in the world.

Persis (پارس)

Persis (Greek Persis; Old Persian Parsa, 𐎱𐎠𐎼𐎿), also called Pars, the ancient Greek name for the Persian homeland in southwestern Iran, roughly modern Fars province, Achaemenid heartland and source of the name Persia.

Sep 21, 2026

Persis Drell

Persis Drell is a particle astrophysicist and Stanford professor who directed SLAC National Accelerator Laboratory from 2007 to 2012 and served as Stanford's 13th provost from 2017 to 2023.

Persis Khambatta

Persis Khambatta, Miss India 1965, was a Parsi model-actress who shaved her head to play Lieutenant Ilia in Star Trek: The Motion Picture (1979), presented at the 1980 Oscars, wrote Pride of India, and died in 1998.

Oct 15, 2026

Persistence diagram

A persistence diagram is a multiset of points in the extended plane, each recording the birth and death scales of a topological feature in persistent homology.

Persistence hunting

Persistence hunting: chasing large prey on foot for hours in midday heat until exhaustion, relying on human sweating and endurance. Documented among Kalahari San and Tarahumara; central to the endurance running hypothesis debate.

Persistence of vision

Persistence of vision is the traditional theory that an image lingers after its source disappears, long used to explain film and animation but largely refuted by vision research.

Persistent atrial fibrillation

Persistent atrial fibrillation (PersAF, persistent AFib) is continuous atrial fibrillation lasting more than 7 days and requiring intervention, distinct from paroxysmal (12 months) forms; higher stroke and mortality risk than paroxysmal AF, treated with anticoagulation, rate/rhythm control, and increasingly first-line ablation.

Persistent cloaca

Persistent cloaca (cloacal malformation, ICD-11 LB17.2) is a rare congenital anomaly in girls where urethra, vagina, and rectum drain through one common perineal channel; incidence about 1 in 50,000, treated by staged reconstructive surgery.

Persistent current

A persistent current is an equilibrium current flowing indefinitely around a ring without applied voltage, common in superconductors and predicted for normal-metal mesoscopic rings in 1983.

Persistent data structure

A persistent data structure preserves every previous version of itself when updated, letting all versions be accessed; techniques include fat nodes, path copying, and structural sharing.

Persistent eustachian valve

Persistent eustachian valve (ORPHA:99120, ICD-10 Q26.8): rare congenital IVC anomaly with postnatal persistence of the eustachian valve remnant; often asymptomatic, but can cause IVC obstruction, thrombosis, endocarditis, or right-to-left shunt with patent foramen ovale.

Persistent fetal circulation

Persistent fetal circulation, also called persistent pulmonary hypertension of the newborn (PPHN), is failure of fetal-to-neonatal circulatory transition causing right-to-left shunting, cyanosis, and refractory hypoxemia in about 1–2 per 1,000 live births.

Persistent fifth aortic arch

Persistent fifth aortic arch (PFAA), double-lumen aortic arch: rare congenital anomaly from failure of the fifth embryonic arch to regress; Weinberg types A to C; associated with coarctation, interrupted arch, VSD, pulmonary atresia.

Persistent genital arousal disorder

Persistent genital arousal disorder (PGAD), also called genito-pelvic dysesthesia, is a distressing condition of unwanted genital arousal without sexual desire, first described in 2001, with prevalence estimates of 0.6–3% and neuropathic, pelvic floor, and medication-related causes.

Sep 29, 2026

Persistent homology

Persistent homology is a topological data analysis method that tracks features like connected components, loops, and voids across scales, summarizing them as a barcode; long-lived features count as signal, short-lived ones as noise.

Persistent hyperinsulinaemic hypoglycaemia of infancy

Persistent hyperinsulinaemic hypoglycaemia of infancy (PHHI), now called congenital hyperinsulinism, is a genetic disorder of dysregulated pancreatic beta-cell insulin secretion causing severe infant hypoglycaemia, most often from ABCC8 or KCNJ11 KATP-channel mutations.

Persistent hyperplastic primary vitreous

Persistent hyperplastic primary vitreous (PHPV), now called persistent fetal vasculature (PFV), is a congenital eye malformation from failed hyaloid vessel regression, usually unilateral, causing infantile leukocoria, microphthalmia, and cataract, and mimicking retinoblastoma.

Persistent idiopathic facial pain

Persistent idiopathic facial pain (PIFP), formerly atypical facial pain, is a rare chronic facial pain recurring daily over 3 months without neurological deficit or identifiable cause, treated conservatively with antidepressants.

Oct 15, 2026

Persistent monitoring and surveillance

Persistent monitoring is a robotics problem where mobile robots repeatedly visit every part of an environment to keep information about it continuously up to date.

Persistent Müllerian duct syndrome

Persistent Müllerian duct syndrome (PMDS), also called persistent Müllerian derivatives, is a rare autosomal recessive 46,XY difference of sex development in which AMH or AMHR2 mutations leave a uterus and fallopian tubes in otherwise normally virilized males, presenting as cryptorchidism or inguinal hernia.

Persistent objector rule

The persistent objector rule, or persistent objector doctrine, lets a State avoid a customary international law norm by clearly objecting during its formation and maintaining that objection; codified in ILC Draft Conclusion 15 (2018), inapplicable to jus cogens.

Persistent organic pollutant

Persistent organic pollutants (POPs) are toxic chemicals, including DDT, PCBs, and dioxins, that resist degradation, accumulate in living tissue, and are restricted under the 2001 Stockholm Convention.

Persistent placoid maculopathy

Persistent placoid maculopathy (PPM) is a rare idiopathic bilateral chorioretinopathy with well-defined white plaque-like macular lesions, first described in 2007, most often affecting Caucasian men in their 50s and 60s.