15-letter words containing a, r, o, l
- balance control — a state of equilibrium or equipoise; equal distribution of weight, amount, etc.
- balloon barrage — a series of moored balloons, usually strung together and hung with cables, for impeding a low-level attack by enemy aircraft.
- ballroom dancer — a person who participates in ballroom dancing
- bandstop filter — A bandstop filter is a filter designed to eliminate all frequencies within a band of frequencies.
- barbizon school — a group of French painters of landscapes of the 1840s, including Théodore Rousseau, Daubigny, Diaz, Corot, and Millet
- barcelona chair — an armless, padded leather chair on a steel frame shaped like a curved X: Barcelona is a trademark for this chair
- barium chloride — a poisonous compound, BaCl2, consisting of flat white crystals that are soluble in water: it is used to treat water, metals, leather, etc.
- barrage balloon — Barrage balloons are large balloons which are fixed to the ground by strong steel cables. They are used in wartime, when the cables are intended to destroy low-flying enemy aircraft.
- bathroom scales — scales typically kept in a bathroom for people to weigh themselves
- beach goldenrod — a composite plant, Solidago sempervirens, of eastern and southern North America, having a thick stem and large, branched, one-sided terminal clusters of yellow flowers, flourishing on sea beaches or salt marshes.
- beet leafhopper — a small leafhopper (Circulifer tenellus) that transmits a very destructive virus to sugar beets
- belgian griffon — one of a variety of the Brussels griffon having a black or reddish-brown and black coat.
- benedict arnold — Benedict, 1741–1801, American general in the Revolutionary War who became a traitor.
- benzal chloride — a colorless, oily liquid, C 7 H 6 Cl 2 , used chiefly in the synthesis of benzaldehyde, and in the manufacture of dyes.
- bernoulli trial — one of a sequence of independent experiments each of which has the same probability of success, such as successive throws of a die, the outcome of which is described by a binomial distribution
- bibliographical — a complete or selective list of works compiled upon some common principle, as authorship, subject, place of publication, or printer.
- bidirectionally — in a bidirectional manner
- billiard parlor — poolroom (def 1).
- binomial series — an infinite series obtained by expanding a binomial raised to a power that is not a positive integer.
- biobibliography — a bibliography containing biographical sketches of the authors listed.
- biot-savart law — the law that the magnetic induction near a long, straight conductor, as wire, varies inversely as the distance from the conductor and directly as the intensity of the current in the conductor.
- black horehound — a hairy unpleasant-smelling chiefly Mediterranean plant, Ballota nigra, having clusters of purple flowers: family Lamiaceae (labiates)
- black operation — a covert and undocumented military operation
- black snakeroot — a tall bugbane, Cimicifuga racemosa, of the buttercup family, of eastern North America, having thin, tapering, toothed or deeply cut leaflets and branched clusters of small, white flowers.
- bladder campion — a European caryophyllaceous plant, Silene vulgaris, having white flowers with an inflated calyx
- blasting powder — a form of gunpowder made with sodium nitrate instead of saltpeter, used chiefly for blasting rock, ore, etc.
- blenheim orange — a type of apple tree bearing gold-coloured apples
- blockade runner — a person, ship etc that tries to carry goods through a blockade
- blockade-runner — a ship or person that passes through a blockade.
- blue wood aster — a composite plant, Aster cordifolius, of North America, having heart-shaped leaves and pale-blue flowers.
- board of health — an agency with responsibility for health in state, country, etc
- board of parole — an agency that determines which prisoners are to be released on parole
- boarding school — A boarding school is a school which some or all of the pupils live in during the school term. Compare day school.
- boolean algebra — a system of symbolic logic devised by George Boole to codify logical operations. It is used in computers
- borderline case — a person or thing that is not clearly classifiable as something
- brachiocephalic — of, relating to, or supplying the arm and head
- branchial pouch — one of a series of rudimentary outcroppings of the inner pharyngeal wall, corresponding to the branchial grooves on the surface.
- brave new world — If someone refers to a brave new world, they are talking about a situation or system that has recently been created and that people think will be successful and fair.
- break the mould — If you say that someone breaks the mould, you mean that they do completely different things from what has been done before or from what is usually done.
- breaking plough — a plough with a long shallow mouldboard for turning virgin land or sod land
- bristol channel — an inlet of the Atlantic, between S Wales and SW England, merging into the Severn estuary. Length: about 137 km (85 miles)
- bristol fashion — clean and neat, with newly painted and scrubbed surfaces, brass polished, etc
- bronchial tubes — the bronchi or their smaller divisions
- bronzed grackle — the western subspecies of the American bird, the common grackle, Quiscalus quiscula versicolor, having bronzy, iridescent plumage.
- brown-tail moth — a white moth, Nygmia phaerrhoea, having a brown tuft at the end of the abdomen, the larvae of which feed on the foliage of various shade and fruit trees.
- bucket elevator — a chain of buckets for raising liquids or materials to a higher level
- buffalo currant — an ornamental shrub, Ribes odoratum, of the central U.S., having showy, drooping clusters of fragrant yellow flowers and edible black fruit.
- buffalo soldier — (formerly, especially among American Indians) a black soldier.
- bulimia nervosa — a disorder characterized by compulsive overeating followed by vomiting: sometimes associated with anxiety about gaining weight
- bullnose header — bull header (def 1).