13-letter words containing a, r, u
- agrobacterium — A soil bacterium, of the genus Agrobacterium, which can fix nitrogen, and causes the formation of crown galls in plants.
- ailurophiliac — Appropriate or pleasing to ailurophiles.
- air ambulance — An air ambulance is a helicopter or plane that is used for taking people to hospital.
- air pollution — contamination of the atmosphere
- air-lift pump — a pump that pumps liquid by injecting air into the lower end of an open pipe immersed in the liquid: often used in boreholes
- air-to-ground — operating between an aircraft in flight and a target on the ground
- airplane rule — aeroplane rule
- airplane turn — a midair turn made in the middle of a jump.
- albertosaurus — A giant fierce carnivorous tyrannosaurus-like dinosaur, of gemus Albertosaurus, discovered in Alberta, Canada.
- albumen paper — a printing paper coated with albumen, salt, and citric acid and sensitized with silver nitrate, used c1850–80.
- albumin color — (in textile printing) a color fixed to a fabric by an albuminous mordant.
- alfred austin — Alfred, 1835–1913, English poet: poet laureate 1896–1913.
- allylthiourea — thiosinamine.
- alonzo church — (person) A twentieth century mathematician and logician, and one of the founders of computer science. Church invented the lambda-calculus and posited a version of the Church-Turing thesis.
- alpha aurigae — Capella
- alphanumerics — Plural form of alphanumeric.
- alpine tundra — a tundra that is treeless because of high elevation rather than high latitude.
- 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
- aluminiferous — containing or yielding aluminium or alumina
- aluminography — algraphy.
- aluminothermy — a process for reducing metallic oxides using finely divided aluminium powder. The mixture of aluminium and the oxide is ignited, causing the aluminium to be oxidized and the metal oxide to be reduced to the metal
- amarantaceous — amaranthine
- amateur night — an entertainment featuring amateur performers, often in competition for prizes.
- ambidexterous — ambidextrous
- ambimoustrous — able to use a computer mouse proficiently with either hand
- america's cup — an international yachting trophy, first won by the schooner America in 1851 and held as a challenge trophy by the New York Yacht Club until 1983
- american curl — a breed of slender cat with curled-back ears and a plumed tail
- amicus curiae — a person not directly engaged in a case who advises the court
- aminoaciduria — the presence of amino acids in urine
- amorphousness — lacking definite form; having no specific shape; formless: the amorphous clouds.
- amphigastrium — any of the small leaves or appendages on the under surface of the stem of some liverworts
- amphitrichous — having a single flagellum at each end.
- anachronously — in an anachronous manner
- anak krakatau — a volcanic island in Indonesia formed by volcanic eruptions during and subsequent to 1927
- ancus marcius — a king of Rome, during whose reign the first bridge across the Tiber was constructed.
- androgynously — In an androgynous manner.
- anfractuosity — the condition or quality of being anfractuous
- angiospermous — of or relating to an angiosperm; having enclosed seeds.
- Ångstrom unit — a unit of length equal to 10 −10 metre, used principally to express the wavelengths of electromagnetic radiations. It is equivalent to 0.1 nanometre
- angular house — any of the four astrological houses that begin at the angles: the first, fourth, seventh, and tenth houses, that correspond, respectively, to self, home, others, and career.
- annual report — a report presented by the directors of a company to its shareholders each year, containing the profit-and-loss account, the balance sheet, and details of the past year's activity
- annular clock — a clock in the form of a vase, ball, etc., having the hours painted on a ring rotating beneath a pointer.
- annular space — An annular space is a ring-shaped space outside the drillpipe, through which mud and cuttings are removed.
- another-guess — of another kind.
- ante-christum — before Christ. Abbreviation: A.C.
- antenniferous — having antennae
- anthraquinone — a yellow crystalline solid used in the manufacture of dyes, esp anthraquinone dyes, which have excellent colour properties. Formula: C6H4(CO)2C6H4
- anti-burglary — the felony of breaking into and entering the house of another at night with intent to steal, extended by statute to cover the breaking into and entering of any of various buildings, by night or day.
- anti-cultural — of or relating to culture or cultivation.
- anti-european — opposed to the European Union or to political union of the countries of Europe