13-letter words containing a, e, r, o
- aeromodelling — the making and flying of model planes
- aerophilately — the study or collection of airmail stamps, cancellations, etc.
- aerosinusitis — inflammation of the nasal sinuses caused by the effect on the sinuses of changes in atmospheric pressure.
- aerosol spray — a substance contained as an aerosol in a spray can
- aerostructure — any separately manufactured unit, component, or section of an aircraft or other vehicle capable of flight
- afforestation — Afforestation is the process of planting large numbers of trees on land which has few or no trees on it.
- aformentioned — Misspelling of aforementioned.
- afro-american — African-American
- afternoon tea — Afternoon tea is a small meal you can have in the afternoon. It includes a cup of tea and food such as sandwiches and cakes.
- afterthoughts — Plural form of afterthought.
- age of reason — a period of European history in the 18th cent. noted for belief in the ability of reason to discover truth, shape society, etc.
- aggiornamento — the process of bringing up to date methods, ideas, etc
- agglomeration — An agglomeration of things is a lot of different things gathered together, often in no particular order or arrangement.
- agglomerative — gathered together into a cluster or mass.
- aggregational — resulting from aggregation
- agro-economic — of or relating to a nation's agricultural economy, the financial problems of farmers as a group, etc.: mounting pressures on the agro-economic system.
- agrobacterium — A soil bacterium, of the genus Agrobacterium, which can fix nitrogen, and causes the formation of crown galls in plants.
- agrochemicals — Plural form of agrochemical.
- agroecologist — One who studies agroecology.
- agroterrorism — the use of biological agents as weapons against agricultural and food-supply industries
- air commodore — a senior officer of the Royal Air Force and certain other air forces, of equivalent rank to brigadier in the Army
- air core coil — having a nonmagnetic core, as one of fiber or plastic, encircled by a coil (air-core coil) or containing one or more such coils: air-core transformer.
- air force one — the US Air Force plane used by the US president
- air injection — injection of liquid fuel into the cylinder of an internal-combustion engine, especially a diesel, by means of a jet of compressed air.
- aircraftwomen — Plural form of aircraftwoman.
- airline pilot — a person who flies planes as a profession and works for a commercial airline
- airplane mode — a setting on a phone or other mobile device that turns off Wi-Fi, cellular, and other wireless connections.
- airport novel — People sometimes refer to long novels such as thrillers and romances that are written in a popular style as airport novels.
- airworthiness — (of an aircraft) meeting established standards for safe flight; equipped and maintained in condition to fly.
- albertosaurus — A giant fierce carnivorous tyrannosaurus-like dinosaur, of gemus Albertosaurus, discovered in Alberta, Canada.
- alcoholometer — an instrument, such as a specially calibrated hydrometer, for determining the percentage of alcohol in a liquid
- alcoholometry — the process of measuring the concentration of alcohol in a liquid, such as in blood or a liquor
- aldosteronism — high blood pressure caused by excess aldosterone in the blood and urine
- alectryomancy — an ancient form of divination, using a rooster to select grains of food placed on letters of the alphabet.
- aleksandropol — a former name of Gumri.
- aleksandrovsk — a city in SE Ukraine, on the Dnieper River.
- all manner of — If you refer to all manner of objects or people, you are talking about objects or people of many different kinds.
- all over with — above in place or position: the roof over one's head.
- allegorically — consisting of or pertaining to allegory; of the nature of or containing allgegory; figurative: an allegorical poem; an allegorical meaning.
- allelomorphic — relating to alleles
- alliterations — Plural form of alliteration.
- allylthiourea — thiosinamine.
- alongshoreman — a person employed to load and unload ships
- alpha blocker — any of various substances that interfere with the action of the alpha receptors.
- alpha-blocker — any of a class of drugs that prevent the stimulation of alpha adrenoceptors, a type of receptor in the sympathetic nervous system, by adrenaline and noradrenaline and that therefore cause widening of blood vessels: used in the treatment of high blood pressure and prostatic hyperplasia
- alphabetiform — having similarities to letters of the alphabet
- alsike clover — a European clover, Trifolium hybridum, having pink flowers, grown in the U.S. for forage.
- alstroemerias — Plural form of alstroemeria.
- altered chord — a chord in which one or more notes are chromatically changed by the introduction of accidentals
- althorp house — a mansion in Northamptonshire: seat of the Earls Spencer since 1508; originally a medieval house; altered (1787) to its present neoclassical style by Henry Holland. Diana, Princess of Wales is buried on Round Oval Island in the centre of the ornamental lake in Althorp Park