All articles starting with P

Polyoxymethylene dimethyl ethers

Polyoxymethylene dimethyl ethers (PODE, also called oxymethylene ethers, OME, or DMMn) are synthetic acetals with formula CH3O(CH2O)nCH3, investigated as diesel substitutes that burn almost soot-free.

Polyp (medicine)

Polyp (medicine): abnormal tissue growth projecting from a mucous membrane into a hollow organ (colon, uterus, stomach); sessile or pedunculated, mostly benign, removed by polypectomy, with adenomas carrying colorectal cancer risk.

Polyp (zoology)

Polyp (zoology): the sessile, tentacled body form of cnidarians, counterpart to the medusa. Corals, anemones, and Hydra are polyps; in Medusozoa the asexual polyp buds medusae, while Anthozoa are polyp-only.

Polyp of gallbladder

Gallbladder polyp (polypoid lesion of the gallbladder): common incidental ultrasound finding, 3%–6% prevalence, mostly benign cholesterol pseudopolyps; malignancy risk low under 10 mm (0.60%), managed by size-based cholecystectomy and surveillance guidelines.

Polyp of vagina

Polyp of vagina (ICD-10 N84.2), chiefly the vaginal fibroepithelial polyp: a benign polypoid lesion with a fibrous or myxoid stromal core covered by squamous epithelium, hormone-sensitive, often in pregnancy, treated by excision.

Polyp of vulva

Polyp of vulva (ICD-11 GA13.0, ICD-10 N84.3), also called vulvar fibroepithelial stromal polyp or skin tag: a benign hormone-sensitive polypoid lesion of fibrovascular stroma lined by squamous epithelium, treated by excision.

Sep 29, 2026

Polypectomy

Polypectomy is the endoscopic removal of polyps, most often from the colon during colonoscopy, using cold or hot snares; adenoma removal cuts colorectal cancer mortality by up to 50%.

Polypedates

Polypedates (whipping frogs, 泛树蛙属), a genus of 25 foam-nesting rhacophorid tree frog species from India, Southeast Asia, the Philippines, and Borneo; sister genus Taruga, type species P. leucomystax.

Polypeptide antibiotic

Polypeptide antibiotics (bacitracin, colistin/polymyxin E, polymyxin B) are peptide antibiotics attacking bacterial walls or membranes; bacitracin treats gram-positive skin infections topically, polymyxins are last-resort injectable drugs for multidrug-resistant gram-negative bacteria.

Polypeptide N-acetylgalactosaminyltransferase

Polypeptide N-acetylgalactosaminyltransferase (GalNAc-T, GALNT, ppGalNAc-T) is a family of 20 human Golgi enzymes, EC 2.4.1.41, that initiate mucin-type O-glycosylation by transferring GalNAc from UDP-GalNAc to serine or threonine, forming the Tn antigen.

Polypeptide, ASFBIOF01 02

ASFBIOF01-02 polypeptide (Agrobody, EVOCA) is a camelid VHH nanobody biofungicide by Biotalys NV that lyses fungi by binding cell membranes; EPA-registered 2025, PC code 004000, not EU-approved.

Polyperchon

Polyperchon was a Macedonian general and officer of Alexander the Great. He served as regent of Macedon and later fought Cassander in the wars of Alexander's successors.

Polypharmacy

Polypharmacy, also called polymedication, is the concurrent use of multiple medications by one patient, commonly defined as five or more drugs, most frequent in older adults; risks include adverse drug events, interactions, falls, and hospitalization, addressed through medication review and deprescribing.

Polyphasic sleep

Polyphasic sleep: distributing sleep into 3+ episodes per 24 h (Uberman, Everyman, Dymaxion schedules) to cut total sleep. Controlled studies show impaired vigilance, reduced deep sleep, and adverse health effects versus monophasic sleep.

Polyphemus (crater on Tethys)

Polyphemus is a 73 km wide impact crater on Tethys, Saturn's icy moon, centered at 3.48°S, 282.98°W. IAU-approved in 1982, it is named for the Cyclops battled by Odysseus, part of Tethys's Odyssey-themed crater names.

Polyphemus (Πολύφημος)

Polyphemus (Πολύφημος), the famous one-eyed Cyclops of Greek mythology, son of Poseidon and Thoosa, blinded by Odysseus in Odyssey 9 and later reimagined as Galatea's lovesick suitor by Theocritus, Vergil, and Ovid.

Polyphenol

Polyphenol: plant secondary metabolite with two or more phenolic rings, including flavonoids and tannins; formerly called vegetable tannins; low bioavailability, gut-microbiota-dependent metabolism, associated with reduced all-cause mortality.

Polyphenol oxidase

Polyphenol oxidase (PPO), also called tyrosinase or catechol oxidase, is a copper enzyme catalyzing oxidation of phenolics to quinones, causing enzymatic browning of cut fruits, vegetables, and mushrooms.

Polyphenyl ether

A polyphenyl ether (PPE) is a synthetic compound of phenyl rings joined by ether linkages, used as a high-temperature, radiation-resistant lubricant and diffusion pump fluid.

Oct 15, 2026

Polyphenylene sulfide

Polyphenylene sulfide (PPS) is a semicrystalline engineering thermoplastic combining heat, flame, and chemical resistance with electrical insulation, first commercialized by Phillips Petroleum in 1973 as Ryton.

Polyphia

Polyphia: American instrumental rock band from Plano, Texas, formed 2010 by Tim Henson and Scott LePage; blends progressive metal guitar with trap, hip-hop, and EDM; albums Muse through Be Not Afraid (2026).

Polyphlebium venosum

Polyphlebium venosum (R.Br.) Copel., veined bristle fern or veined filmy fern, a Hymenophyllaceae filmy fern of SE Australia and New Zealand; translucent fronds, trumpet-shaped indusia, epiphytic on Dicksonia antarctica; basionym Trichomanes venosum R.Br. 1810.

Oct 15, 2026

Polyphon (company)

Polyphon was a Leipzig company founded in 1887 as Brachhausen & Rießner, best known for its disc-playing music boxes and largest in Europe around 1900.

Oct 22, 2026

Polyphonic novel

The polyphonic novel (полифонический роман) is a concept coined by Russian theorist Mikhail Bakhtin in his 1929 study of Dostoevsky, describing a novel of independent, unmerged voices none subordinated to the author.

Polyphony

Polyphony (Greek πολυφωνία, many voices) is a musical texture of two or more independent melodic lines sounding at once, distinct from monophony and homophony, created through counterpoint, central to medieval and Renaissance music, and found in folk traditions worldwide.