All articles A–Z

Duodenal polyp

Duodenal polyp: mucosal or submucosal growth in the duodenum, found in 0.6–5% of upper endoscopies; adenomas (10–20%) are premalignant and removed endoscopically, with bleeding and perforation risks higher than in the colon.

Duodenal switch

The duodenal switch (BPD-DS) is a bariatric operation combining sleeve gastrectomy with intestinal bypass, giving the greatest weight loss and diabetes remission among standard procedures.

Duodenal ulcer

A duodenal ulcer is a break in the lining of the duodenum, the first part of the small intestine, and a form of peptic ulcer disease.

Duodenal varices

Duodenal varices, also called duodenal varix, are ectopic portosystemic collateral veins in the duodenum from portal hypertension; rare (0.2-0.4% on endoscopy), prone to massive bleeding with up to 40% mortality, treated endoscopically or by TIPS/BRTO.

Duodenectomy

Duodenectomy is the surgical removal of all or part of the duodenum, the first section of the small intestine, performed for tumors, trauma, and duodenal polyposis in familial adenomatous polyposis.

Duodenitis

Duodenitis is inflammation of the duodenum, the first part of the small intestine. Main causes are H. pylori infection, excess stomach acid, and NSAID overuse; treated with antibiotics and acid reducers.

Duodenopancreatectomy

Duodenopancreatectomy, most often called the Whipple operation or pancreaticoduodenectomy, is surgery removing the pancreatic head and duodenum, the standard treatment for pancreatic head and periampullary cancers.

Duodenoscopes

Duodenoscopes, also called ERCP endoscopes, are flexible side-viewing endoscopes passed into the duodenum for pancreatobiliary therapy; over 500,000 US ERCP procedures yearly, with reprocessing challenges and infection risk driving disposable designs.

Duodenoscopy

Duodenoscopy is the endoscopic examination of the duodenum using a flexible scope passed through the mouth; the side-viewing duodenoscope visualizes the major papilla and serves as the platform for ERCP.

Duodenostomy

Duodenostomy is a surgically created opening into the duodenum, made by placing a tube through the duodenal wall to decompress the lumen, protect a repair suture line, or drain a perforation.

Duodenum

Duodenum: first, C-shaped segment of the small intestine, 25–30 cm, from pylorus to ligament of Treitz; receives bile and pancreatic secretions via ampulla of Vater; secretes secretin, CCK, GIP; site of celiac biopsy and peptic ulcers.

Duoethnography

Duoethnography is a qualitative research method in which two or more researchers of difference dialogically juxtapose their life histories, producing reconstructed dialogues rather than transcripts.

Sep 20, 2026

Duojia Pan

Duojia Pan (潘多加), also published as Pan Duojia, is an HHMI investigator and Physiology chairman at UT Southwestern known for discovering the Hippo signaling pathway, which halts organ growth and whose failure drives tumors.

Duolicious

Duolicious, also known as Duolicious.app, is a free, open-source dating app created by an anonymous 4chan user in 2023 that matches users by personality quiz answers instead of swiping.

Duolingo

Duolingo (Duolingo, Inc.) is a Pittsburgh edtech company founded in 2011 by Luis von Ahn and Severin Hacker, offering freemium gamified language courses, Math, Music, Chess, and the Duolingo English Test; 58.7M DAUs and $298.5M Q2 2026 revenue.

Duolingo Max

Duolingo Max is a subscription tier of the Duolingo language learning app, announced in 2023. It uses GPT-4 and GPT-4o to offer advanced features like Video Call with Lily.

Sep 19, 2026

Duomi Music

Duomi Music (多米音乐) was a Beijing-based music-streaming platform that led China's mobile music clients in 2012, listed on the NEEQ in 2016, and shut down in 2018.

Oct 22, 2026

Dương Đình Nghệ

Dương Đình Nghệ was a Vietnamese warlord who expelled Southern Han forces in 931 and ruled Tĩnh Hải quân as military governor until his assassination in 937.

Dương Văn Minh

Dương Văn Minh (Big Minh, 1916–2001), South Vietnamese general who led the 1963 coup against Diem, was chief of state in 1963–64, and as last president surrendered Saigon on 30 April 1975.

Duopoly

A duopoly is a market with two sellers, the smallest form of oligopoly, exemplified by Boeing and Airbus, which deliver over 95 percent of large commercial aircraft.

DUOX2

DUOX2 (dual oxidase 2, formerly THOX2) is a chromosome 15 gene encoding a calcium-dependent NADPH oxidase that generates hydrogen peroxide for thyroid hormone synthesis; mutations cause thyroid dyshormonogenesis-6, congenital hypothyroidism.

Sep 23, 2026

Duoyan Three Guards

The Duoyan Three Guards (朵颜三卫), also known as the Uriankhai Three Guards, were the Duoyan, Taining, and Fuyu guard commanderies established among Mongol tribes on the Ming northeastern frontier in 1389.

DuPage County, Illinois

DuPage County, Illinois: a Chicago-area collar county established February 9, 1839 from Cook County, named for the DuPage River, county seat Wheaton since 1867, population 932,877 (2020).

Dupahiya

Dupahiya (दुपहिया) is a Hindi Prime Video comedy-drama set in Dhadakpur, Bihar, where a stolen dowry motorbike disrupts the village's 25-year crime-free celebration; two seasons, 2025 and 2026.

Dupatta

Dupatta (दुपट्टा/دوپٹہ), also called odhani or chunni, is a 2–2.5 m unstitched South Asian scarf worn with salwar kameez and lehenga, from Vedic uttariya roots, serving modesty, ritual, and fashion roles.

Dupe (product)

A dupe (product dupe), short for duplicate, is a lower-priced product made to resemble a costlier one, sold legally under its own brand rather than as a counterfeit.

Oct 15, 2026

DUPIC

DUPIC (Direct Use of spent PWR fuel In CANDU) is a proposed nuclear fuel cycle that refabricates spent PWR fuel into CANDU reactor fuel without chemical separation.

Dupilumab

Dupilumab (Dupixent) is a fully human IgG4 monoclonal antibody against IL-4Rα that blocks IL-4/IL-13 signaling. First approved 2017 for atopic dermatitis, now indicated across asthma, CRSwNP, EoE, PN, COPD, CSU, and bullous pemphigoid.