13-letter words containing m, a, t, r
- atka mackerel — a commercially important ocean greenling (Pleurogrammus monopterygius) of the northern Pacific, esp. the area off the Aleutian Islands
- atmospherical — pertaining to, existing in, or consisting of the atmosphere: atmospheric vapors.
- atomic energy — nuclear energy
- atomic number — the number of protons in the nucleus of an atom of an element
- atomic theory — any theory in which matter is regarded as consisting of atoms, esp that proposed by John Dalton postulating that elements are composed of atoms that can combine in definite proportions to form compounds
- attested form — a linguistic form that can be shown to be in use or in written records
- 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
- avant-gardism — the attitudes, techniques, etc., of the cultural avant-garde.
- azurmalachite — a blue-green ornamental stone consisting of a mixture of azurite and malachite.
- backformation — Alternative spelling of back-formation.
- baggagemaster — a person employed, especially by a railroad, bus company, or steamship line, to take charge of passengers' baggage.
- ballet master — a man who teaches and rehearses the dancers in a ballet company
- 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.
- bartholomew i — (Dimitrios Archontonis) born 1940, Archbishop of Constantinople and Ecumenical Patriarch of the Eastern Orthodox Church since 1991.
- basement-rock — the undifferentiated assemblage of rock (basement rock) underlying the oldest stratified rocks in any region: usually crystalline, metamorphosed, and mostly, but not necessarily, Precambrian in age.
- bass trombone — the lower-pitched of the two main types of trombone
- bastard amber — a color of gelatin commonly used in stage lighting, similar to light amber but having a pinkish cast.
- battering ram — A battering ram is a long heavy piece of wood that is used to knock down the locked doors of buildings.
- battering-ram — an ancient military device with a heavy horizontal ram for battering down walls, gates, etc.
- beam splitter — a system that divides a beam of light, electrons, etc, into two or more paths
- bear the palm — to be the winner; take the prize
- 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.
- beleaguerment — a blockade or siege
- bergamot mint — an aromatic herb, Mentha piperita citrata, having a lemonlike odor when crushed.
- bharat natyam — a form of Indian classical ballet
- biculturalism — the characteristics, or policy, of a two-cultured society
- binary system — a system involving only two elements, as 0 and 1 or yes and no.
- bipartisanism — the quality of being bipartisan
- bitter almond — a variety of almond whose bitter seeds yield hydrocyanic acid upon hydrolysis
- black margate — a grayish grunt, Anisotremus surinamensis, of the Atlantic Ocean from Florida to Brazil.
- 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
- blamestorming — a discussion or meeting for the purpose of assigning blame.
- board meeting — a meeting of the board of a company or other organization
- bohr magneton — a unit that is used to indicate the magnetic moment of the electron structure in an atom, equal to 9.27 × 10 −21 erg/gauss.
- bomber jacket — A bomber jacket is a short jacket which is gathered into a band at the waist or hips.
- boom operator — a person who operates a boom
- bootlace worm — a nemertean worm, Lineus longissimus, that inhabits shingly shores and attains lengths of over 6 m (20 ft)
- boston matrix — a two-dimensional matrix, used in planning the business strategy of a large organization, that identifies those business units in the organization that generate cash and those that use it
- bottom drawer — a young woman's collection of clothes, linen, cutlery, etc, in anticipation of marriage
- bowman's root — an eastern U.S. plant, Gillenia trifoliata, of the rose family, having terminal clusters of white flowers.
- brahminy kite — a common kite, Haliastur indus, of southern Asia and the southwest Pacific islands, having reddish-brown plumage with a white head and breast.
- brainstorming — intensive discussion to solve problems or generate ideas