18-letter words containing a, d, v, i
- acquired behaviour — the behaviour of an organism resulting from the effects of the environment
- activated charcoal — a form of carbon having very fine pores: used chiefly for adsorbing gases or solutes, as in various filter systems for purification, deodorization, and decolorization.
- adaptive answering — (communications) A feature which allows a faxmodem to answer the telephone and decide whether the incoming call is a fax or data call. Most Class 1 faxmodems do this. The U.S. Robotics Class 1 implementation however seems not to do it, it must be set to answer as either one or the other.
- adaptive radiation — evolution of a number of divergent species from a common ancestor, each species becoming adapted to occupy a different environment. This type of evolution occurred in the Tertiary manuals and the Mesozoic reptiles
- administrative law — law relating to the control of government power
- adverse possession — the occupation or possession of land by a person not legally entitled to it. If continued unopposed for a period specifed by law, such occupation extinguishes the title of the rightful owner
- advertising agency — An advertising agency is a company whose business is to create advertisements for other companies or organizations.
- advice and consent — a phrase in the Constitution (Article II, Section 2) allowing the Senate to restrain presidential powers of appointment and treaty-making.
- affective disorder — any mental disorder, such as depression or mania, that is characterized by abnormal disturbances of mood
- aids-related virus — a variant of the AIDS virus. Abbreviation: ARV.
- alternative comedy — a style of comedy originating in the UK in the 1980s that seeks to avoid racist or sexist stereotypes, and usually puts forward left-wing, anti-establishment views
- an overgrown child — an adult whose behaviour is characteristic of a child
- andorre la vieille — French name for the capital of Andorra, situated in the west of the principality. Pop: 22 035 (2003 est)
- angle of deviation — the angle between the direction of the refracted ray and the direction of the incident ray when a ray of light passes from one medium to another
- anniversary dinner — a dinner held to celebrate an event that occurred in some previous year
- appellate division — the section of a court that hears appeals, sometimes existing as an intermediate court between a trial court and a court of last resort.
- armed intervention — an official response to a situation which involves the armed forces
- augmented interval — an interval that is a half step greater than the corresponding major or perfect interval
- authorized version — the revised English translation of the Bible published in England in 1611 with the authorization of King James I
- avoirdupois weight — a British and American system of weights based on a pound of 16 ounces
- biodiversification — the process by which the diversity of plants or animals develops or is increased within a particular region or group of organisms.
- camp david accords — a peace treaty between Israel and Egypt issuing from talks at Camp David between Egyptian President Sadat, Israeli Prime Minister Begin, and the host, U.S. President Carter: signed in 1979.
- cassini's division — the gap that divides Saturn's rings into two parts, discovered by Giovanni Domenico Cassini (1625–1712) in 1675
- cepheid (variable) — any of a class of pulsating, yellow, supergiant stars whose brightness varies in regular periods: from the period-luminosity relation, the distance of such a star can be determined
- cerenkov radiation — radiation emitted when a charged particle travels through a medium at a speed greater than the speed of light through that medium
- cheval de bataille — a horse used in battle; charger.
- christian endeavor — an organization of young people of various evangelical Protestant churches, formed in 1881 to promote Christian principles and service.
- citta del vaticano — Vatican City
- cobalt violet deep — a medium to strong purple color.
- comodoro rivadavia — a city in E Argentina.
- compact video disc — a compact laser disc that plays both pictures and sound
- comparative method — a body of procedures and criteria used by linguists to determine whether and how two or more languages are related and to reconstruct forms of their hypothetical parent language.
- conductivity water — water that has a conductivity of less than 0.043 × 10–6 S cm–1
- conservation grade — relating to food produced using traditional methods where possible, and following strict specifications regarding animal feeds and welfare, the use of chemical fertilizers, wildlife conservation, and land management
- continental divide — the watershed of a continent, esp (often caps.) the principal watershed of North America, formed by the Rocky Mountains
- cultural diversity — the cultural variety and cultural differences that exist in the world, a society, or an institution: Dying languages and urbanization are threats to cultural diversity.
- curvature of field — a monochromatic aberration of a lens or other optical system in which the focal surface is curved, the refracted image of an object oriented perpendicular to the axis of the lens lying on a curved surface rather than in a plane perpendicular to the axis.
- david lloyd george — David, 1st Earl of Dwyfor [doo-vawr] /ˈdu vɔr/ (Show IPA), 1863–1945, British statesman: prime minister 1916–22.
- daytime television — television broadcasts that are shown during the daytime rather than in the evening
- deductive database — (database) A combination of a conventional database containing facts, a knowledge base containing rules, and an inference engine which allows the derivation of information implied by the facts and rules. Commonly, the knowledge base is expressed in a subset of first-order logic and either a SLDNF or Datalog inference engine is used.
- definitive plumage — the plumage of a bird that, once attained, does not change significantly in color or pattern for the rest of the bird's life.
- delmarva peninsula — a peninsula of the northeast US, between Chesapeake Bay and the Atlantic
- dependent variable — a variable in a mathematical equation or statement whose value depends on that taken on by the independent variable
- descriptive clause — a relative clause that describes or supplements but is not essential in establishing the identity of the antecedent and is usually set off by commas in English. In This year, which has been dry, is bad for crops the clause which has been dry is a nonrestrictive clause.
- detective sergeant — a police officer who investigates crime and who ranks above a detective constable but below a detective inspector
- devil's paintbrush — a perennial European hawkweed (Hieracium aurantiacum) with leafless flower stalks bearing a cluster of orange-red heads: now a common weed in N U.S. and Canada
- digital switchover — the process of changing the method of transmitting television from analogue to digital format
- digital television — a television broadcasting technology in which signals are transmitted as a sequence of binary numbers.
- digital video disc — Digital Versatile Disc
- diphtheria vaccine — a vaccine used to produce immunity against diphtheria
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