16-letter words containing r, a
- active transport — a process by which molecules are enabled to pass across a membrane from a region in which they are in a low concentration to one of high concentration; this requires the expenditure of energy in metabolism and is assisted by carrier proteins, commonly referred to as pumps
- ad eundem gradum — to, of, or in the same rank or standing: pertaining to a university recognizing the academic credentials of a student transferring from another university by granting the student comparable status.
- adaptive routing — dynamic routing
- addition polymer — a polymer formed by the direct reaction of two or more monomers, and with no resulting water or other by-product.
- additive inverse — the number that must be added to a number to equal zero
- additive process — a photographic process in which the desired colours are produced by adding together appropriate proportions of three primary colours
- adhesive plaster — adhesive tape, especially in wide sheets.
- adirondack chair — a sturdy armchair for outdoor use, made of wide wooden slats, with a sloping back and a seat often slanting down toward it.
- adjective phrase — An adjective phrase or adjectival phrase is a group of words based on an adjective, such as 'very nice' or 'interested in football.' An adjective phrase can also consist simply of an adjective.
- adjutant general — a member of the Army Board responsible for personnel and administrative functions
- administrational — the management of any office, business, or organization; direction.
- administratively — pertaining to administration; executive: administrative ability.
- administratrices — Plural form of administratrix.
- admirable bolete — an edible mushroom, Boletus mirabilis, of Rocky Mountain and Pacific northwestern evergreen forests, having a dark-red, scaly or woolly cap with yellow pores and a stout stem.
- adventure racing — a contest in which teams compete in an expedition-length race which involves two or more sporting disciplines, often running, mountain biking, climbing, kayaking, and elements of navigation and orienteering
- adverbial phrase — a group of two or more words that function together as an adverb, as the phrase in a minute in I'll be with you in a minute.
- 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
- aerometeorograph — an aircraft instrument that records temperature, humidity, and atmospheric pressure
- aerotherapeutics — the treatment of disease by the use of air, esp. by exposing patients to changes in atmospheric pressure
- aesthetic labour — workers employed by a company for their appearance or accent, with the aim of promoting the company's image
- affaire de coeur — an affair of the heart; love affair
- affirmative flag — a flag having five horizontal stripes, blue, white, red, white, and blue, from top to bottom, signifying “yes”: letter C in the International Code of Signals.
- african american — a black American of African descent.
- african elephant — a type of elephant that is native to Africa
- 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
- african marigold — a tropical American plant, Tagetes erecta, cultivated for its yellow or orange flower heads and strongly scented foliage: family Asteraceae (composites)
- african wild dog — a mottled dog of Africa, Lycaon pictus
- african-american — African-Americans are black people living in the United States who are descended from families that originally came from Africa.
- african-canadian — a Canadian of African descent
- agency agreement — an agreement between a business and an agent appointed to promote its interests
- aggregate demand — the total demand for goods and services in an economy at a specified price level and in a specified time period
- aggregate supply — the total supply of goods and services produced by a national economy in a specified time period, at a specified price level
- agreed procedure — an official set of guidelines of the steps that should be followed in the event of a dispute between two parties, esp in arbitration between employee and employer
- agricultural ant — harvester ant.
- agustin iturbide — Agustín de [ah-goos-teen de] /ˌɑ gusˈtin dɛ/ (Show IPA), 1783–1824, Mexican soldier and revolutionary: as Agustín I, emperor of Mexico 1822–23.
- ai international — (company) One of distributors of Prolog++, subsumed by Customer Engagement Company before December 1998.
- air conditioning — Air conditioning is a method of providing buildings and vehicles with cool dry air.
- air vice-marshal — a senior Royal Air Force officer of equivalent rank to a rear admiral in the Royal Navy
- air-raid shelter — a structure, often located underground, that is designed to protect people during an air raid
- air-raid warning — an alarm that sounds to warn people when an air raid is expected
- aircraft carrier — An aircraft carrier is a warship with a long, flat deck where aircraft can take off and land.
- airmail envelope — an envelope made of the very thin blue paper that is used to send letters by airmail
- airplane carrier — an aircraft carrier.
- alder flycatcher — a North American flycatcher, Empidonax alnorum, of alder thickets and other moist areas, that has greenish-brown upper parts and whitish underparts and is almost indistinguishable except by voice from E. traillii (willow flycatcher)
- aleutian current — a current in the Pacific Ocean that flows eastward between latitudes 40° and 50° N.
- alexander baring — Alexander, 1st Baron Ashburton, 1774–1848, British statesman.
- alexander dubcek — Alexander, 1921–92, Czechoslovakian political leader: first secretary of the Communist Party 1968–69.
- alexander island — island of Antarctica, just west of the base of the Antarctic Peninsula, in the British Antarctic Territory: c. 16,700 sq mi (43,253 sq km)