19-letter words containing a, e, r, o, d, u
- developable surface — a surface that can be flattened onto a plane without stretching or compressing any part of it, as a circular cone.
- diamond-leaf laurel — a tree, Pittosporum rhombifolium, of Australia, having coarsely toothed, oval or diamond-shaped leaves and white flowers, widely planted as an ornamental in the southwestern U.S.
- difference equation — (mathematics) A relation between consecutive elements of a sequence. The first difference is D u(n) = u(n+1) - u(n) where u(n) is the nth element of sequence u. The second difference is u(n+2) + a u(n+1) + b u(n) = 0 can be converted to a difference equation (in this case, a second order linear difference equation): D2 u(n) + p D u(n) + q u(n) = 0 and vice versa. a, b, p, q are constants.
- directional coupler — (communications) (tap) A passive device used in cable systems to divide and combine radio frequency signals. A directional coupler has at least three ports: line in, line out, and the tap. The signal passes between line in and line out ports with loss referred to as the insertion loss. A small portion of the signal power applied to the line in port passes to the tap port. A signal applied to the tap port is passed to the line in port less the tap attenuation value. The tap signals are isolated from the line out port to prevent reflections. A signal applied to the line out port passes to the line in port and is isolated from the tap port. Some devices provide more than one tap output line (multi-taps).
- discretionary trust — a trust in which the beneficiaries' shares are not fixed in the trust deed but are left to the discretion of other persons, often the trustees
- discriminated union — (theory) The discriminated union of two sets A and B is A + B = {(inA, a) | a in A} U {(inB, b)| b in B} where inA and inB are arbitrary tags which specify which summand an element originates from. A type (especially an algebraic data type) might be described as a discriminated union if it is a sum type whose objects consist of a tag to say which part of the union they belong to and a value of the corresponding type.
- dollard-des-ormeaux — a town in S Quebec, in E Canada: suburb of Montreal.
- domain architecture — (systems analysis) A generic, organisational structure or design for software systems in a domain. The domain architecture contains the designs that are intended to satisfy requirements specified in the domain model. A domain architecture can be adapted to create designs for software systems within a domain and also provides a framework for configuring assets within individual software systems.
- double-helical gear — herringbone gear.
- draw the curtain on — to end
- early purple orchid — a Eurasian orchid, Orchis mascula, with purplish-crimson flowers and stems marked with blackish-purple spots
- east dunbartonshire — a council area of central Scotland to the N of Glasgow: part of Strathclyde region from 1975 until 1996: mainly agricultural and residential. Administrative centre: Kirkintilloch. Pop: 106 970 (2003 est). Area: 172 sq km (66 sq miles)
- ebola virus disease — Also called Ebola fever, Ebola hemorrhagic fever, Ebola virus disease. a usually fatal disease, a type of hemorrhagic fever, caused by the Ebola virus and marked by high fever, severe gastrointestinal distress, and bleeding.
- educational adviser — a person who provides advice and training to teachers about teaching methods and educational policies
- endowment assurance — a form of life insurance that provides for the payment of a specified sum directly to the policyholder at a designated date or to his beneficiary should he die before this date
- endowment insurance — Endowment insurance is a type of life insurance that pays a particular sum directly to the policyholder at a stated date, or to a beneficiary if the policyholder dies before this date.
- environmental audit — the systematic examination of an organization's interaction with the environment, to assess the success of its conservation or antipollution programme
- euclidean algorithm — Euclid's Algorithm
- factitious disorder — any of various syndromes, as Münchausen syndrome, characterized by physical or psychological symptoms intentionally produced by a person and under voluntary control.
- feather-duster worm — any tube-dwelling polychaete worm of the families Sabellidae and Serpulidae, the numerous species having a crown of feathery tentacles used in feeding and respiration.
- fluoride toothpaste — toothpaste containing a small amount of fluoride as protection against tooth decay
- free alongside quay — (of a shipment of goods) delivered to the quay without charge to the buyer
- get one's dander up — to become or to cause someone to become annoyed or angry
- go under the hammer — to be offered for sale by an auctioneer
- goldbach conjecture — an unproved theorem that every even integer greater than 2 can be written as the sum of two prime numbers.
- grand duke nicholas — of Cusa [kyoo-zuh] /ˈkyu zə/ (Show IPA), 1401–1464, German cardinal, mathematician, and philosopher. German Nikolaus von Cusa.
- grievance procedure — the established series of steps to be taken in dealing with a grievance raised with an employer by an employee
- ground-plane aerial — a quarter-wave vertical dipole aerial in which the electrical image forming the other quarter-wave section is formed by reflection in a system of radially disposed metal rods or in a conductive sheet
- guillaume de lorris — 13th-century French poet who wrote the first 4058 lines of the allegorical romance, the Roman de la rose, continued by Jean de Meung
- handlebar moustache — a man's moustache having long, curved ends that resemble the handlebars of a bicycle.
- henry david thoreau — Henry David, 1817–62, U.S. naturalist and author.
- household insurance — an arrangement in which you pay money to a company, and they pay money to you if your household goods are stolen or damaged
- human rights record — the facts that are known about the tendency of a country, regime, etc, to observe and protect human rights
- hydropneumatization — utilization of air pressure in the housing of a water turbine to keep the level of water that has been used from rising to interfere with the rotor blades.
- idea of pure reason — any of the three undemonstrable entities (a personal soul, a cosmos, and a supreme being) implicit in the fact of a subject and an object of knowledge, and in the need for some principle uniting them.
- index expurgatorius — a list of books now included in the Index Librorum Prohibitorum, forbidden to be read except from expurgated editions.
- induction hardening — a process in which the outer surface of a metal component is rapidly heated by means of induced eddy currents. After rapid cooling the resulting phase transformations produce a hard wear-resistant skin
- introduction agency — a company whose business is to match romantic partners for a fee
- ipratropium bromide — an anticholinergic bronchodilator, C 20 H 30 BrNO 3 , used in the treatment of chronic bronchitis and in airway obstruction diseases.
- judicial conference — a conference of judges held to discuss improvements in methods or judicial procedure through court rules or otherwise.
- judicial separation — a decree of legal separation of spouses that does not dissolve the marriage bond.
- keyboard instrument — any musical instrument that is played using a keyboard
- lucia di lammermoor — an opera (1835) by Gaetano Donizetti, based on Sir Walter Scott's novel The Bride of Lammermoor.
- magnesium hydroxide — a white, crystalline, slightly water-soluble powder, Mg(OH) 2 , used chiefly in medicine as an antacid and as a laxative.
- manchester autocode — (language, history) The predecessor of Mercury Autocode.
- mary mcleod bethune — Mary McLeod [muh-kloud] /məˈklaʊd/ (Show IPA), 1875–1955, U.S. educator and civil-rights leader.
- master of foxhounds — the person responsible for the conduct of a fox hunt and to whom all members of the hunt and its staff are responsible. Abbreviation: M.F.H.
- means of production — resources: equipment, workers
- midnight regulation — a rule or directive approved by the federal government near the end of a president’s term of office
- mordvinian republic — a constituent republic of W central Russia, in the middle Volga basin. Capital: Saransk. Pop: 888 700 (2002). Area: 26 200 sq km (10 110 sq miles)