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17-letter words containing r

  • actinic keratosis — a precancerous skin condition, characterized by rough red, scaly patches; it is caused by cumulative exposure to the sun and is most common in fair-skinned people
  • activation energy — the least amount of energy required to activate atoms or molecules to a state in which they can undergo a chemical reaction.
  • activation record — (compiler)   (Or "data frame", "stack frame") A data structure containing the variables belonging to one particular scope (e.g. a procedure body), as well as links to other activation records. Activation records are usually created (on the stack) on entry to a block and destroyed on exit. If a procedure or function may be returned as a result, stored in a variable and used in an outer scope then its activation record must be stored in a heap so that its variables still exist when it is used. Variables in the current scope are accessed via the frame pointer which points to the current activation record. Variables in an outer scope are accessed by following chains of links between activation records. There are two kinds of link - the static link and the dynamic link.
  • active ingredient — the part of a substance or compound that produces its chemical or biological effect
  • active vocabulary — the total number of words a person uses in his own speech and writing
  • actuarial science — Actuarial science is a specialist branch of mathematics applying the laws of statistics and probability to insurance.
  • acupressure point — any of the specific points on the body where pressure is applied in acupressure
  • adaptive learning — (algorithm)   (Or "Hebbian learning") Learning where a system programs itself by adjusting weights or strengths until it produces the desired output.
  • addition reaction — a reaction in which part of a compound is added to one end of a double or triple bond, while the rest adds to the other end, converting it, respectively, to a single or double bond.
  • adjective pronoun — a pronoun used as an adjective, as his in His dinner is ready.
  • adjunct professor — a professor employed by a college or university for a specific purpose or length of time and often part-time.
  • administratorship — a person who manages or has a talent for managing.
  • admiralty islands — a group of about 40 volcanic and coral islands in the SW Pacific, part of Papua New Guinea, in the Bismarck Archipelago: main island: Manus. Pop (whole province): 43 589 (2000). Area: about 2000 sq km (800 sq miles)
  • advance directive — a living will or durable power of attorney in which a person states his or her wishes regarding medical treatment in the event of mental incompetency or an inability to communicate.
  • adventure holiday — a holiday that involves some physically challenging activity such as canoeing, rock climbing, etc
  • adventure tourism — tourism involving activities that are physically challenging
  • adventuresomeness — The state or quality of being adventuresome.
  • adverse selection — Adverse selection is a term used to describe the tendency of those in dangerous jobs or with high-risk lifestyles to want to take out life insurance.
  • aerial photograph — a photograph taken from the air
  • aerobic digestion — Aerobic digestion is a process which uses bacteria and oxygen to break down organic and biological waste.
  • aerobic-exercises — Also called aerobic exercises. (used with a plural verb) any of various sustained exercises, as jogging, rowing, swimming, or cycling, that stimulate and strengthen the heart and lungs, thereby improving the body's utilization of oxygen.
  • aerothermodynamic — Of or pertaining to aerothermodynamics.
  • affaire d'honneur — a duel
  • affiliation order — (formerly) an order made by a magistrates' court that a man adjudged to be the father of an illegitimate child shall contribute a specified periodic sum towards the child's maintenance
  • affiliative drive — the urge to form friendships and attachments, typically prompting a person to attend social gatherings and join organizations as a way of preventing loneliness and gaining emotional security.
  • african army worm — the caterpillar of a widely distributed noctuid moth, Spodoptera exempta, which travels in vast hordes and is a serious pest of cereal crops and grasses in Africa and parts of Australia
  • african-caribbean — African-Caribbean refers to people from the Caribbean whose ancestors came from Africa.
  • afternoon session — a part of an event taking place in the afternoon
  • aftershave lotion — a lotion, usually styptic and perfumed, for application to the face after shaving
  • against the grain — contrary to one's feelings, nature, wishes, etc.; irritating or displeasing
  • age before beauty — (often said humorously when yielding precedence) older people take precedence over younger people
  • age of discretion — the age at which a person is considered to be able to manage his or her own affairs
  • agent provocateur — An agent provocateur is a person who is employed by the government or the police to encourage certain groups of people to break the law, so they can arrest them or make them lose public support.
  • aggravated murder — a murder made more serious by its violent circumstances
  • agree to disagree — If two people who are arguing about something agree to disagree or agree to differ, they decide to stop arguing because neither of them is going to change their opinion.
  • agreement to sell — a contract between two parties in which one party agrees to sell something to the other
  • agricultural show — a display of agricultural equipment and livestock, often including competitions, entertainment, and a trade fair
  • air chief marshal — a senior officer of the Royal Air Force and certain other air forces, of equivalent rank to admiral in the Royal Navy
  • air-transportable — that can be transported by aircraft: air-transportable equipment.
  • aircraft observer — U.S. Army. observer (def 4).
  • aircraft-observer — someone or something that observes.
  • alaskan king crab — king crab (def 2).
  • alcala de henares — city in central Spain, near Madrid: pop. 159,000
  • alexander severus — a.d. 208?-235; Rom. emperor ( a.d. 222-235)
  • alexandrian senna — a tropical leguminous plant, Cassia acutifolia, having yellow flowers and long pods
  • alfalfa butterfly — a sulfur butterfly, Colias eurytheme, having orange wings edged with black, the larvae of which feed on alfalfa and other legumes.
  • algorithmic model — (programming)   A method of estimating software cost using mathematical algorithms based on the parameters which are considered to be the major cost drivers. These estimate of effort or cost are based primarily on the size of the software or Delivered Source Instructions (DSI)s, and other productivity factors known as Cost Driver Attributes. See also Parametric Model.
  • all over the occy — in every direction
  • all over the shop — If something is happening all over the shop, it is happening in many different places or throughout a wide area.
  • all the better to — more suitable to
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