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17-letter words containing a, t

  • acetyl-coenzyme a — the acetylated form of coenzyme A, formed as an intermediate in the oxidation of carbohydrates, fats, and protein in animal metabolism.
  • acetylene welding — a type of welding that uses an acetylene torch
  • acetylformic acid — pyruvic acid.
  • achromatic colour — colour, such as white, black, and grey, that is devoid of hue
  • acidity regulator — a substance, such as citric acid, added to food to change or maintain its pH value
  • acme screw thread — a type of screw thread having inclined flat flanks and a flat top and bottom: used in machine tools
  • acoustic feedback — a type of feedback that is created when there is a sound loop linking an audio input and an audio output, such that a high-pitched squealing sound is produced
  • acoustoelectronic — denoting a device in which electronic signals are converted into acoustic waves, esp in delay lines, etc
  • acquaintance rape — a rape that is carried out by someone that the victim knows
  • acquired immunity — the immunity produced by exposure of an organism to antigens, which stimulates the production of antibodies
  • acquisition costs — Acquisition costs are the total costs of writing or issuing an insurance policy.
  • acrosome reaction — the release of enzymes from the acrosome when a spermatozoon encounters the ovum, allowing fusion with the ovum in the sexual reproductive process
  • act of contrition — a short prayer of penitence
  • act of parliament — a law that has been passed by both of the UK Houses of Parliament and has received royal assent
  • act of toleration — the statute (1689) granting religious freedom to dissenting Protestants upon meeting certain conditions.
  • act of uniformity — any of the three statutes (1549, 1559, 1662) regulating public worship services in the Anglican Church, especially the act of 1662 requiring the use of the Book of Common Prayer.
  • 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
  • activated alumina — a granular highly porous and adsorptive form of aluminium oxide, used for drying gases and as an oil-filtering material and catalyst
  • 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 euthanasia — the deliberate act of killing someone painlessly, esp to relieve suffering from an incurable illness
  • active ingredient — the part of a substance or compound that produces its chemical or biological effect
  • active language i — (tool, mathematics)   An early interactive mathematics system for the XDS 930 at the University of California at Berkeley.
  • active suspension — a type of suspension in a car that is controlled by an onboard computer and improves the vehicle's roadholding so that it takes corners, accelerates, and brakes more smoothly
  • active vocabulary — the total number of words a person uses in his own speech and writing
  • actual total loss — the complete destruction or loss of a piece of property that has been insured, or damage that is so extensive that the item can no longer be salvaged or used
  • 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 compound — adduct (def 2).
  • 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.
  • additive identity — an element that when added to a given element in a specified set leaves that element unchanged, as zero in the real-number system.
  • adenylate cyclase — an enzyme that catalyzes the conversion of ATP to cyclic AMP.
  • 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)
  • adoptive immunity — passive immunity resulting from the administration of sensitized lymphocytes from an immune donor.
  • 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.
  • advanced standing — the status of a student who has already completed some of the requirements of a course at another institution and thus is able to miss out some elements of the full course at his or her current university
  • 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.
  • advocatus diaboli — devil's advocate
  • 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.
  • aerothermodynamic — Of or pertaining to aerothermodynamics.
  • affective fallacy — a proposition in literary criticism that a poem should be analyzed and described in terms of its own internal structure and not in terms of the emotional response it arouses in the reader.
  • 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
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