12-letter words containing a, s, u, i
- ballet suite — music written for a ballet but suitable or arranged for performance in an orchestral concert.
- bankruptcies — Plural form of bankruptcy.
- barbiturates — any of a group of barbituric acid derivatives, used in medicine as sedatives and hypnotics.
- barquisimeto — a city in NW Venezuela. Pop: 1 009 000 (2005 est)
- base bullion — smelted lead containing impurities, as gold, silver, or zinc, that are later removed.
- base jumping — a sport in which a participant parachutes from any of a variety of fixed objects such as high buildings, cliffs, etc
- bashi-bazouk — a member of the notoriously brutal 19th-cent. Turkish irregulars
- bashibazouks — Plural form of bashibazouk.
- basque shirt — a knitted pullover shirt having a crew neck, long or short sleeves, and a pattern of horizontal stripes.
- bathing suit — A bathing suit is a piece of clothing which people wear when they go swimming.
- bathophilous — (of an organism) living in very deep water
- bearskin rug — the pelt of a bear, used as a rug
- beaumarchais — Pierre Augustin Caron de (pjɛr oɡystɛ̃ karɔ̃ də). 1732–99, French dramatist, noted for his comedies The Barber of Seville (1775) and The Marriage of Figaro (1784)
- beautifulest — (dated) Most beautiful; more beautiful than anyone or anything else.
- beauty strip — a narrow forest corridor left uncut alongside a road or body of water.
- behaviourism — Behaviourism is the belief held by some psychologists that the only valid method of studying the psychology of people or animals is to observe how they behave.
- bilingualism — Bilingualism is the ability to speak two languages equally well.
- bioacoustics — the study of animals' use of sound
- biohazardous — a pathogen, especially one used in or produced by biological research.
- biscuit ware — unglazed earthenware
- black muslim — a member of the Black Muslims
- blastulation — the process of blastula formation
- blue catfish — a large freshwater catfish, Ictalurus furcatus, that is a popular food fish in the states of the Mississippi River valley.
- blue jasmine — a southern U.S. shrubby vine, Clematis crispa, of the buttercup family, having solitary, bell-shaped, blue or bluish-purple to pink flowers and bearing fruit with silky appendages.
- blues guitar — blues guitar music
- bluesnarfing — the practice of using one Bluetooth-enabled mobile phone to steal contact details, ring tones, images, etc from another
- brains trust — a group of knowledgeable people who discuss topics in public or on radio or television
- braunschweig — Brunswick
- bridal suite — a room or set of rooms in a hotel for newly married couples
- brushability — the quality of being brushable
- buccaneerish — of or relating to a buccaneer
- buenos aires — the capital of Argentina, a major port and industrial city on the Río de la Plata estuary: became capital in 1880; university (1821). Pop: 13 349 000 (2005 est)
- buffalo fish — any of a genus (Ictiobus) of large, humpbacked, freshwater sucker fishes found in North America
- bull mastiff — a large powerful breed of dog with a short usually fawn or brindle coat, developed by crossing the bulldog with the mastiff
- bunco artist — a confidence trickster or con artist
- burkina faso — an inland republic in W Africa: dominated by Mossi kingdoms (10th–19th centuries); French protectorate established in 1896; became an independent republic in 1960; consists mainly of a flat savanna plateau. Official language: French; Mossi and other African languages also widely spoken. Religion: mostly animist, with a large Muslim minority. Currency: franc. Capital: Ouagadougou. Pop: 17 812 961 (2013 est). Area: 273 200 sq km (105 900 sq miles)
- burnt sienna — a reddish-brown dye or pigment obtained by roasting raw sienna in a furnace
- burro's tail — a succulent Mexican plant, Sedum morganianum, of the stonecrop family, bearing small, rose-colored flowers and long, hanging, nearly cylindrical stems with closely packed whitish-green leaves.
- bushwhacking — to make one's way through woods by cutting at undergrowth, branches, etc.
- bushy-tailed — bright-eyed and bushy-tailed, fresh, alert, eager, and lively
- byelorussian — Byelorussian means belonging or relating to Byelorussia or to its people or culture.
- cacophonious — cacophonous
- calamitously — In a calamitous manner.
- calculations — Plural form of calculation.
- calixtus iii — (Alfonso de Borja; Alfonso Borgia) 1378–1458, Spanish ecclesiastic: pope 1455–58.
- callistus ii — died 1124, French ecclesiastic: pope 1119–24.
- calumniators — Plural form of calumniator.
- calumniously — in a calumnious manner
- calycoideous — calycoid
- canterburies — Plural form of canterbury.