12-letter words containing a, b, o
- book matches — safety matches made of paper and fastened into a small cardboard folder
- booklet pane — Philately. any of a number of panes or small pages of postage stamps, stapled together into a booklet for the convenience of users.
- boolean ring — a nonempty collection of sets having the properties that the union of two sets of the collection is a set in the collection and that the relative complement of each set with respect to any other set is in the collection.
- boomer state — Oklahoma
- boomeranging — a bent or curved piece of tough wood used by the Australian Aborigines as a throwing club, one form of which can be thrown so as to return to the thrower.
- booster seat — A booster seat or a booster cushion is a special seat which allows a small child to sit in a higher position, for example at a table or in a car.
- boot-scraper — a contraption consisting of an upright metal shape formerly placed outside some houses to enable people to scrape the mud from their boots before going in
- bootleg play — a play in which the quarterback pretends to hand the ball to a teammate, hides it by placing it next to his hip, and runs with it.
- border guard — a guard stationed on a border between countries
- border state — a state adjacent to a border
- border taxes — taxes payable on goods taken across a border
- born-digital — relating to or noting documents, images, etc., that are created and managed in electronic form: electronic preservation of born-digital content; a born-digital e-book that will not be available in print.
- borosilicate — a salt of boric and silicic acids
- borough hall — a building housing the administrative offices of a borough.
- bothy ballad — a folk song, esp one from the farming community of NE Scotland
- botticellian — Sandro [san-droh,, sahn-;; Italian sahn-draw] /ˈsæn droʊ,, ˈsɑn-;; Italian ˈsɑn drɔ/ (Show IPA), (Alessandro di Mariano dei Filipepi) 1444?–1510, Italian painter.
- bottle glass — glass used for making bottles, consisting of a silicate of sodium, calcium, and aluminium
- bottle party — a party to which guests bring drink
- bottlewasher — a person or machine that washes bottles.
- bottom break — a branch coming from the bottom of a plant stem, usually formed by pinching and disbudding.
- bottom grass — any grass that grows on bottoms or lowlands.
- bottom quark — a type of quark with a mass of c. 4.7 to 5.3 GeV/c2, a negative charge that is 1⁄3 the charge of an electron, zero charm, and zero strangeness
- bottom yeast — a yeast whose cells, in the manufacture of wine and lager beer, fall to the bottom as a sediment.
- boudin blanc — a boiled sausage made with light-colored meat, as veal or chicken, and without blood
- bougainville — an island in the W Pacific, in Papua New Guinea: the largest of the Solomon Islands: unilaterally declared independence in 1990; occupied by government troops in 1992, and granted autonomy in 2001. Chief town: Kieta. Area: 10 049 sq km (3880 sq miles)
- boulangerite — a bluish lead-gray mineral, lead antimony sulfide, Pb 5 Sb 4 S 11 , a minor ore of lead.
- boulder clay — an unstratified glacial deposit consisting of fine clay, boulders, and pebbles
- boulevardier — (originally in Paris) a fashionable man, esp one who frequents public places
- bounce flash — a flash lamp designed to produce a bounced flash.
- bound charge — any electric charge that is bound to an atom or molecule (opposed to free charge).
- bowel cancer — cancer of the colon
- bowling ball — a round, heavy ball for bowling, usually made of hard rubber or plastic, with holes drilled into it for the bowler's thumb and two fingers.
- box lacrosse — a form of lacrosse played indoors, usually on a hockey rink with a wooden floor, between two teams of six players.
- box magazine — a rectangular cartridge holder in a submachine or light machine gun.
- boxgrove man — a type of primitive man, probably Homo heidelbergensis, and probably dating from the Middle Palaeolithic period some 500 000 years ago; remains were found at Boxgrove in West Sussex in 1993 and 1995
- boxing match — a competition between two boxers
- boyoma falls — a series of seven cataracts in the NE Democratic Republic of Congo, on the upper River Congo: forms an unnavigable stretch of 90 km (56 miles), which falls 60 m (200 ft)
- brachycerous — (of insects) having short antennae
- bracket foot — a corner foot of a chest or the like joining the sides in a concave line.
- braggadocios — empty boasting; bragging.
- brain tumour — a tumour that is situated in the brain
- brainstormer — a person who brainstorms
- branch depot — one of a several depots receiving stock from the same central supplier
- branch point — Electricity. a point in an electric network at which three or more conductors meet.
- brass-collar — unwaveringly faithful to a political party; voting the straight ticket: a brass-collar Democrat.
- brassfounder — a person who makes things from brass
- break ground — to do something that has not been done before
- break of day — dawn; daybreak.
- breaker zone — the area offshore where waves break, between the outermost breaker and the limit of wave uprush; the zone within which waves approaching the coastline start breaking, usually in water depths of 16 to 32 feet (5 to 10 meters).
- breakthrough — A breakthrough is an important development or achievement.