19-letter words containing r, a, d, u
- least recently used — (operating systems) (LRU) A rule used in a paging system which selects a page to be paged out if it has been used (read or written) less recently than any other page. The same rule may also be used in a cache to select which cache entry to flush. This rule is based on temporal locality - the observation that, in general, the page (or cache entry) which has not been accessed for longest is least likely to be accessed in the near future.
- longitudinal parity — (storage, communications) An extra byte (or word) appended to a block of data in order to reveal corruption of the data. Bit n of this byte indicates whether there was an even or odd number of "1" bits in bit position n of the bytes in the block. The parity byte is computed by XORing the data bytes in the block. Longitudinal parity allows single bit errors to be detected.
- 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.
- maturation division — a stage in meiosis during which the chromosomal number of the reproductive cell is reduced to one chromosome from each original chromosome pair.
- 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)
- mother-of-thousands — strawberry geranium.
- mount desert island — an island off the coast of E central Maine: summer resort; forms part of Acadia National Park. 14 miles (23 km) long; 8 miles (13 km) wide.
- mouse-ear chickweed — any of various similar and related plants of the genus Cerastium
- mucopolysaccharides — Plural form of mucopolysaccharide.
- muhammadan calendar — Muslim calendar.
- mulheim an der ruhr — a city in North Rhine-Westphalia, W Germany, near Essen.
- munchausen syndrome — a factitious disorder in which otherwise healthy individuals seek to hospitalize themselves with feigned or self-induced pathology in order to receive surgical or other medical treatment.
- neighbourhood watch — a scheme under which members of a community agree together to take responsibility for keeping an eye on each other's property, as a way of preventing crime
- neuropsychodynamics — The theoretical synthesis of neuroscience and psychodynamics.
- nonproprietary drug — A nonproprietary drug is a generic drug that is essentially similar to a drug with a brand name.
- normal distribution — a theoretical frequency distribution represented by a normal curve.
- noughts and crosses — tick-tack-toe (def 1).
- noughts-and-crosses — tick-tack-toe (def 1).
- nuclear disarmament — the gradual reduction and eventual elimination of all nuclear weapons in the world
- oak-leaved geranium — a geranium, Pelargonium quercifolium, of southern Africa, having oaklike leaves with purple veins and sparse clusters of purple flowers with darker markings.
- occupational hazard — a danger or hazard to workers that is inherent in a particular occupation: Silicosis is an occupational hazard of miners.
- old church slavonic — the oldest attested Slavic language, an ecclesiastical language written first by Cyril and Methodius in a Bible translation of the 9th century and continued in use for about two centuries. It represents the South Slavic, Bulgarian dialect of 9th-century Salonika with considerable addition of other South and West Slavic elements. Abbreviation: OCS.
- olive-backed thrush — Swainson's thrush.
- optical double star — two stars that appear as one if not viewed through a telescope with adequate magnification, such as two stars that are separated by a great distance but are nearly in line with each other and an observer (optical double star) or those that are relatively close together and comprise a single physical system (physical double star)
- ordnance survey map — An Ordnance Survey map is a detailed map produced by the British or Irish government map-making organization.
- orthopaedic surgeon — a surgeon specializing in the branch of surgery concerned with disorders of the spine and joints and the repair of deformities of these parts
- orthopaedic surgery — surgery concerned with disorders of the spine and joints and the repair of deformities of these parts
- out of the ordinary — of no special quality or interest; commonplace; unexceptional: One novel is brilliant, the other is decidedly ordinary; an ordinary person.
- oxidation-reduction — a chemical reaction between two substances in which one substance is oxidized and the other reduced.
- parliament building — structure housing legislative offices
- pecuniary advantage — financial advantage that is dishonestly obtained by deception and that constitutes a criminal offence
- peroxysulfuric acid — persulfuric acid (def 1).
- perpetual adoration — uninterrupted adoration of the Blessed Sacrament.
- perpetual debenture — a bond or debenture that can either never be redeemed or cannot be redeemed on demand
- police headquarters — building where police are stationed
- potassium hydroxide — a white, deliquescent, water-soluble solid, KOH, usually in the form of lumps, sticks, or pellets, that upon solution in water generates heat: used chiefly in the manufacture of soap, as a laboratory reagent, and as a caustic.
- preproduction trial — a trial to test a prototype of a product before the product goes into full-scale production
- pride and prejudice — a novel (1813) by Jane Austen (written 1796–97).
- procedural language — (language) Any programming language in which the programmer specifies an explicit sequences of steps to follow to produce a result (an algorithm). The term should not be confused with "imperative language" - a language that specifies explicit manipulation of state. An example (non-imperative) procedural language is LOGO, which specifies sequences of steps to perform but does not have an internal state. Other procedural languages include Basic, Pascal, C, and Modula-2. Both procedural and imperative languages are in contrast to declarative languages, in which the programmer specifies neither explicit steps nor explicit state manipulation.
- production platform — offshore power station
- profitability study — a study of how much profit a company, organization, etc, makes or how profitable it is
- progressive judaism — Reform Judaism.
- proto-indo-european — the unattested prehistoric parent language of the Indo-European languages; Indo-European.
- pseudo-aristocratic — of or relating to government by an aristocracy.