13-letter words containing a, m, u, r
- armamentarium — the items that comprise the material and equipment used by a physician in his professional practice
- armour-bearer — a retainer who carried the arms or armour of a warrior
- armour-plated — An armour-plated vehicle or building has a hard metal covering in order to protect it from gunfire and other missiles.
- asylum seeker — An asylum seeker is a person who is trying to get asylum in a foreign country.
- atomic number — the number of protons in the nucleus of an atom of an element
- audience room — a room for holding formal interviews or hearings.
- aum shinrikyo — a syncretistic Japanese cult combining elements of Buddhism, Hinduism, and Christianity, founded by Shoko Asahara in 1986; responsible for a number of murders and in particular a nerve-gas attack on the Tokyo underground in 1995
- australianism — the Australian national character or spirit
- autapomorphic — (biology) Describing any characteristic that has evolved in only a single species (or other taxon).
- autoeroticism — the arousal and use of one's own body as a sexual object, as through masturbation
- automatograph — a device for recording involuntary bodily movements.
- autoradiogram — autoradiograph
- autumn crocus — a liliaceous plant, Colchicum autumnale, of Europe and N Africa having pink or purplish autumn flowers
- azurmalachite — a blue-green ornamental stone consisting of a mixture of azurite and malachite.
- balsam spruce — either of two North American coniferous trees of the genus Picea, P. pungens (the blue spruce) or P. engelmanni
- balsamiferous — yielding or producing balsam
- baluster stem — a stem of a drinking glass or the like having a gradual swelling near the top or bottom.
- band spectrum — a spectrum consisting of a number of bands of closely spaced lines that are associated with emission or absorption of radiation by molecules
- bankrupt worm — a roundworm (genus Trichostrongylus) that is an intestinal parasite of birds and mammals, especially devastating to young livestock.
- barium yellow — a yellow, crystalline compound, BaCrO 4 , used as a pigment (barium yellow)
- baryon number — the number of baryons in a system minus the number of antibaryons
- beat the drum — a musical percussion instrument consisting of a hollow, usually cylindrical, body covered at one or both ends with a tightly stretched membrane, or head, which is struck with the hand, a stick, or a pair of sticks, and typically produces a booming, tapping, or hollow sound.
- beau brummell — any dandy or fop
- beleaguerment — a blockade or siege
- bermuda grass — a widely distributed grass, Cynodon dactylon, with wiry creeping rootstocks and several purplish spikes of flowers arising from a single point: used for lawns, pasturage, binding sand dunes, etc
- bermuda onion — a large white or yellow onion with a mild flavor, grown in Texas, California, etc.
- biculturalism — the characteristics, or policy, of a two-cultured society
- bildungsroman — a novel concerned with a person's formative years and development
- bimolecularly — in a bimolecular fashion
- binary number — a number expressed in binary notation, as 1101.101 = 1 × 23 + 1 × 22 + 0 × 21 + 1 × 20 + 1 × 2–1 + 0 × 2–2 + 1 × 2–3 = 13 5⁄8
- black mustard — a Eurasian plant, Brassica (or Sinapsis) nigra, with clusters of yellow flowers and pungent seeds from which the condiment mustard is made: family Brassicaceae (crucifers)
- blame culture — the tendency to look for one person or organization that can be held responsible for a bad state of affairs, an accident, etc
- board measure — a system of units for measuring wood based on the board foot. 1980 board feet equal one standard
- bosman ruling — an EU ruling that allows out-of-contract footballers to leave their clubs without the clubs receiving a transfer fee
- brigham young — Andrew (Jackson, Jr.) born 1932, U.S. clergyman, civil-rights leader, politician, and diplomat: mayor of Atlanta, Georgia, 1981–89.
- brown mustard — black mustard. See under mustard (def 2).
- bumble around — When someone bumbles around or bumbles about, they behave in a confused, disorganized way, making mistakes and usually not achieving anything.
- bureaucratism — an official of a bureaucracy.
- burglar alarm — A burglar alarm is an electric device that makes a bell ring loudly if someone tries to enter a building by force.
- burmese glass — an American art glass of the late 19th century, ranging from greenish-yellow to pink.
- burnham scale — the salary scale for teachers in English state schools, which is revised periodically
- bus mastering — bus master
- cadmium green — a pigment used in painting, consisting of a mixture of hydrated oxide of chromium with cadmium sulfide, and characterized by its strong green color and slow drying rate.
- camera lucida — an instrument attached to a microscope, etc to enable an observer to view simultaneously the image and a drawing surface to facilitate the sketching of the image
- camphoraceous — similar to camphor
- cantus firmus — an existing melody used as the basis for a new polyphonic composition
- carbonium ion — type of positively charged organic ion
- carcinomatous — a malignant and invasive epithelial tumor that spreads by metastasis and often recurs after excision; cancer.
- carpetmuncher — Alternative form of carpet muncher.
- cash customer — a purchaser who pays cash rather than by check, credit card, or charge account.