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Duplessis Orphans
Duplessis Orphans (les Orphelins de Duplessis): thousands of Quebec children, 1930s-1960s, falsely certified mentally deficient and placed in church-run psychiatric institutions for federal subsidies; documented abuse, 1962 report, 1990s lawsuits, compensation 1999-2006.
Duplex (building)
A duplex (plural duplexes), also called a duplex house, is a single residential building containing two complete dwelling units, each with its own kitchen, bathroom, and entrance, arranged side by side or stacked.
Duplex (film)
Duplex is a 2003 American black comedy directed by Danny DeVito, written by Larry Doyle, starring Ben Stiller, Drew Barrymore, and Eileen Essell as rent-controlled tenant Mrs. Connelly; released by Miramax September 26, 2003, grossing about $10 million worldwide.
Duplex (geology)
In structural geology, a duplex is an array of thrust faults splaying up from a floor thrust and recombining onto a roof thrust, stacking slices called horses.
Duplex (telecommunications)
Duplex, or duplex communication, is a telecommunications mode allowing transmission in both directions between two points: full duplex operates simultaneously, while half duplex does not; simplex carries one way only.
Duplex locomotive
A duplex locomotive, also called a duplex drive locomotive, is a steam locomotive with two engine units on one rigid frame, first built in America in 1937.
Duplex sequencing
Duplex sequencing is an error-corrected DNA sequencing method, introduced in 2012, that tags and reads both strands of every molecule to suppress errors by several orders of magnitude.
Duplex stainless steel
Duplex stainless steel is a family of stainless steels with a roughly 50/50 ferrite and austenite microstructure, giving about twice the yield strength of austenitic grades plus chloride resistance.
Duplex telegraphy
Duplex telegraphy is the simultaneous transmission of two telegraph messages, one in each direction, over a single wire. J. B. Stearns introduced the first practical system in 1868.
Duplex ultrasonography
Duplex ultrasonography is a diagnostic imaging technique combining B-mode vessel imaging with pulsed-wave Doppler flow measurement, the modality of choice for deep vein thrombosis and carotid stenosis.
Duplexer
A duplexer is a three-port RF device that lets a transmitter and receiver share a single antenna simultaneously while blocking transmit leakage into the receiver.
Duplicate (1998 film)
Duplicate (डुप्लीकेट) is a 1998 Hindi action comedy directed by Mahesh Bhatt for Dharma Productions, starring Shah Rukh Khan in a double role as chef Bablu and gangster Manu; released 8 May 1998, it flopped with ₹10.17 crore net in India.
Duplicate bridge
Duplicate bridge: tournament form of contract bridge, also called board bridge, in which identical pre-dealt hands are replayed at multiple tables and scored comparatively by matchpoints or IMPs, removing deal luck; governed by the WBF's Laws of Duplicate Bridge.
Duplicate publication
Duplicate publication, also called redundant publication, is republishing a paper that substantially overlaps one already published without citing it; ICMJE and COPE treat it as misconduct, distinguishable from salami slicing, typically remedied by retraction.
Duplicati
Duplicati is a free, open-source backup client that stores encrypted, incremental, compressed backups on local disks, cloud storage services, and remote file servers, with a browser-based interface.
Duplication of the pituitary gland
Duplication of the pituitary gland (DPG, hypophyseal duplication, DPG-plus syndrome) is an ultra-rare midline malformation with duplicated pituitary stalks and glands in a duplicated sella, plus craniofacial, vertebral, vascular, and endocrine anomalies.
Duplication of ureter
Duplication of ureter (duplex kidney, double ureter, ICD-11 LB31.A, ICD-10 Q62.5) is a congenital anomaly with two ureters draining one kidney; complete or incomplete forms follow the Weigert-Meyer rule and may cause reflux, ureterocele, or obstruction.
Duplication of urethra
Duplication of urethra (urethral duplication, ORPHA:237) is a rare congenital anomaly with two urethral channels, classified by Effmann types I-III, affecting mainly boys, causing UTIs, double stream, or incontinence, treated individually by surgery.
Duplications of chromosome 21
Duplications of chromosome 21, also called partial or segmental trisomy 21, are extra copies of all or part of Hsa21 (ICD-11 LD41). Rare (~200 reported cases), they underpin Down syndrome critical region mapping and gene dosage research.
Duplicity (2025 film)
Tyler Perry's Duplicity (2025) is a Prime Video mystery thriller written, directed, and produced by Tyler Perry, starring Kat Graham, Meagan Tandy, Tyler Lepley, and RonReaco Lee; released March 20, 2025, 109 minutes, rated R, with 0% on Rotten Tomatoes.
Duplo
Duplo is a traditional Tagalog game-like drama in verse, played at funeral wakes during the Spanish colonial period, where participants stage a mock court trial in improvised rhymed poetry.
Duplodnaviria
Duplodnaviria is an ICTV virus realm (established 2020) of dsDNA viruses with HK97-fold major capsid proteins, terminase packaging, and portal proteins, spanning tailed bacterial and archaeal viruses (Caudoviricetes) and herpesviruses (Herviviricetes).
DuPont
DuPont, formally DuPont de Nemours, Inc., is an American materials science company founded in 1802 as a gunpowder maker, known for nylon, Teflon, and Kevlar.
DuPont analysis
DuPont analysis, also called the DuPont model or DuPont identity, is a framework that breaks return on equity into net profit margin, asset turnover, and financial leverage.
Dupont de Ligonnès murders and disappearance
Unsolved 2011 Nantes case: Xavier Dupont de Ligonnès, 50, suspected of shooting his wife Agnès and four children plus two labradors and burying them under the family terrace; he disappeared at Roquebrune-sur-Argens on 15 April 2011 and remains France's most famous fugitive.
DuPont Experimental Station
The DuPont Experimental Station, founded in 1903, is DuPont's principal research and development campus in Wilmington, Delaware, and the birthplace of nylon, Kevlar, and Tyvek.
Duppi-Teshub
Duppi-Teshub (Duppi-Teššub, also spelled Tuppi-Teshub) was a king of Amurru, a Syrian kingdom between the Hittite and Egyptian spheres, grandson of Aziru and vassal of Muršili II, circa 1321–1295 BCE.
Dupuytren's contracture
Dupuytren's contracture: fibrotic thickening of palmar fascia bending fingers (ring, little) into the palm; no cure. Treatments are fasciectomy, needle fasciotomy, collagenase injection; surgery most durable, higher recurrence with needle techniques.
Duqqa (دقة)
Duqqa (دقة), also dukkah or du'ah, is an Egyptian coarse blend of toasted nuts, sesame, coriander, cumin, salt, and pepper, eaten with bread dipped in olive oil; distinct from za'atar and from the garlic-vinegar koshari sauce of the same name.
Duque de Caxias
Duque de Caxias, Baixada Fluminense municipality in Rio de Janeiro state, Brazil, created 1943 from Nova Iguaçu and named for the Duke of Caxias; 808,161 people (2022), oil refining and industrial economy.