16-letter words containing o, r, i, y
- ability grouping — a system whereby students are separated into different groups or classes according to test scores or relative scholastic ability, as to assure that gifted students are not inhibited by slower learners.
- abscission layer — a layer of parenchyma cells that is formed at the bases of fruits, flowers, and leaves before abscission. As the parenchyma disintegrates, the organ becomes separated from the plant
- acanthopterygian — of, relating to, or belonging to the Acanthopterygii, a large group of teleost fishes having spiny fin rays. The group includes most saltwater bony fishes
- acetyl promazine — acepromazine
- acid house party — a professionally organized party for young people, with Acid House music, sometimes held in a field or disused building
- actinopterygians — Plural form of actinopterygian.
- active directory — (operating system) A directory service from Microsoft Corporation, similar in concept to Novell Netware Directory Services, that also integrates with the user organisation's DNS structure and is interoperable with LDAP. Active Directory is included in Windows 2000.
- addition polymer — a polymer formed by the direct reaction of two or more monomers, and with no resulting water or other by-product.
- advisory opinion — an opinion given by a court on a case that does not settle the case but sets out the court's view of how the law or the constitution would apply to that case
- advisory teacher — a teacher who visits schools to advise teachers on curriculum developments within a particular subject area
- african honeybee — killer bee.
- african mahogany — any of several African trees of the meliaceous genus Khaya, esp K. ivorensis, that have wood similar to that of true mahogany
- amidinohydrazone — any of a group of pesticides, originally developed as antimalarial and antitubercular drugs, that impair cell respiration in cockroaches, red ants, and other insects.
- angiographically — By the use of angiography.
- angular velocity — the velocity of a body rotating about a specified axis measured as the rate of change of the angle subtended at that axis by the path of the body
- anne of brittany — 1477–1514, wife of Maximilian I of Austria 1490–91; queen consort of Charles VIII of France 1491–98; queen consort of Louis XII of France 1499–1514.
- anomalistic year — the interval between two successive passages of the earth through perihelion; 365.25964 mean solar days
- antihypertension — Pathology. elevation of the blood pressure, especially the diastolic pressure. an arterial disease characterized by this condition.
- antiinflammatory — Alternative spelling of anti-inflammatory.
- antirecessionary — used to counteract or offest the economic effects of a recession: the president's antirecessionary program.
- antoinette perry — Antoinette, 1888–1946, U.S. actress, theatrical manager, and producer.
- anxiety disorder — any of various mental disorders characterized by extreme anxiety and including panic disorder, post-traumatic stress disorder, and generalized anxiety disorder
- anxiety neurosis — a relatively mild form of mental illness characterized by extreme distress and agitation, often occurring without any obvious cause
- april fool's day — April Fool's Day is the 1st of April, the day on which people traditionally play tricks on each other.
- april fools' day — April 1, a day when practical jokes or tricks are played on unsuspecting people.
- aratus of sicyon — 271–213 b.c, Greek general: leader of the Achaean League.
- archaeologically — In an archaeological manner.
- aristocratically — In an aristocratic manner.
- arteriocapillary — Relating to the arteries and the capillaries.
- arthroscopically — By means of arthroscopy.
- assembly routine — assembler (def 2a).
- at liberty to do — If someone is at liberty to do something, they have been given permission to do it.
- attorney-in-fact — a person authorized by power of attorney to act on the authorizer's behalf outside a court of law.
- auditory aphasia — aphasia in which there is no comprehension of spoken words; word deafness.
- auditory vesicle — the pouch that is formed by the invagination of an ectodermal placode and that develops into the internal ear.
- authority figure — a person whose real or apparent authority over others inspires or demands obedience and emulation: Parents, teachers, and police officers are traditional authority figures for children.
- autoregressively — In an autoregressive manner.
- auxiliary police — a part-time reserve attached to a regular police force
- aversion therapy — a method of suppressing an undesirable habit, such as excessive smoking, by causing the subject to associate an unpleasant effect, such as an electric shock or nausea, with the habit
- axis of symmetry — Mathematics. a straight line for which every point on a given curve has corresponding to it another point such that the line connecting the two points is bisected by the given line.
- baltimore canyon — a submarine valley cut into the continental shelf and slope seaward of Chesapeake Bay.
- barium hydroxide — a white poisonous crystalline solid, used in the manufacture of organic compounds and in the preparation of beet sugar. Formula: Ba(OH)2
- basic vocabulary — the set of lexical items in a language that are most resistant to replacement, referring to the most common and universal elements of human experience, such as parts of the body (foot, eye), universal features of the environment (water, star), common activities (eat, sleep), and the lowest numerals.
- bayonet practice — drill in the use of a bayonet
- before your time — If you say that something was before your time, you mean that it happened or existed before you were born or before you were able to know about it or remember it.
- behavior therapy — therapy employing behavior modification
- benzoyl peroxide — a white, crystalline, water-insoluble, explosive solid, C 7 H 5 O 4 , used chiefly as a bleaching agent for flour, fats, oils, and waxes, and as a catalyst in polymerization reactions.
- bertillon system — a system formerly in use for identifying persons, esp criminals, by means of a detailed record of physical characteristics
- beryllium copper — a copper alloy containing a small amount of beryllium and often some nickel or cobalt, having high strength, hardness, and electrical conductivity.
- bidirectionality — capable of reacting or functioning in two, usually opposite, directions.
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