15-letter words containing m, o, s, a
- antiromanticism — the opposition to romanticism
- apartment house — a building containing a number of residential apartments.
- apophthegmatise — to speak in apophthegms
- apophthegmatist — a person who creates apophthegms
- apple macintosh — Macintosh
- approximateness — The quality of being approximate.
- aqueous ammonia — ammonia (def 2).
- aqueous-ammonia — a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH 3 , usually produced by the direct combination of nitrogen and hydrogen gases: used chiefly for refrigeration and in the manufacture of commercial chemicals and laboratory reagents.
- archaeastronomy — (astronomy, archaeology) The historical, especially archeological, study of astronomy; the study of the astronomical systems and methods of ancient cultures often embracing the astrology and cosmology of the past.
- archeoastronomy — the branch of archaeology that deals with the apparent use by prehistoric civilizations of astronomical techniques to establish the seasons or the cycle of the year, especially as evidenced in the construction of megaliths and other ritual structures.
- aristotelianism — a philosophical tradition based on the wide-ranging belief system of Aristotle
- armaments depot — a store for armaments
- arms inspection — the official checking of a country's weapons and other military equipment, usually to check that international agreements have been respected
- army air forces — a unit comprising almost all aviation, with its personnel, equipment, etc.: it became part of the Air Force on July 26, 1947.
- army-navy store — a retail store selling a stock of surplus army, naval, and other military apparel and goods, often at bargain rates.
- arrondissements — Plural form of arrondissement.
- asbestos cement — a compound of asbestos fiber and Portland cement formerly used for various nonstructural building purposes.
- assemblypersons — Plural form of assemblyperson.
- assimilationism — the theory of promoting the incorporation and mixing of different groups in society
- assimilationist — a person who favours and promotes the incorporation and mixing of different groups in society
- astrodynamicist — a person who studies astrodynamics
- astrophotometry — the measurement of the intensity of light of celestial objects.
- as…as they come — the most characteristic example of a class or type
- atlantic salmon — a valuable food and game fish, Salmo salar, mainly of northern coastal Atlantic waters or, when spawning, in freshwater streams tributary to the ocean.
- atlas mountains — a mountain system of N Africa, between the Mediterranean and the Sahara. Highest peak: Mount Toubkal, 4165 m (13 664 ft)
- atmospherically — pertaining to, existing in, or consisting of the atmosphere: atmospheric vapors.
- autocannibalism — The eating of part of one's own body.
- autodidacticism — any self-directed learning or self-education
- automatic focus — a system in a camera which automatically adjusts the lens so that the object being photographed is in focus, often one using infrared light to estimate the distance of the object from the camera
- autotransformer — a transformer in which part of the winding is common to both primary and secondary circuits
- azobisformamide — (chemistry) azodicarbonamide.
- baptism of fire — If someone who has just begun a new job has a baptism of fire, they immediately have to cope with very many severe difficulties and obstacles.
- barry mountains — a mountain range in SE Australia, in E Victoria: part of the Australian Alps
- basidiomycetous — belonging or pertaining to the basidiomycetes.
- basse-normandie — a region of NW France, on the English Channel: consists of the Cherbourg peninsula in the west rising to the Normandy hills in the east; mainly agricultural
- bathing costume — A bathing costume is a piece of clothing that is worn for swimming, especially by women and girls.
- bathroom scales — scales typically kept in a bathroom for people to weigh themselves
- bear comparison — to be sufficiently similar in class or range to be compared with (something else), esp favourably
- beat one's gums — to talk much and idly
- beat one's meat — to masturbate
- before the mast — as an apprentice seaman
- binomial series — an infinite series obtained by expanding a binomial raised to a power that is not a positive integer.
- bituminous coal — a soft black coal, rich in volatile hydrocarbons, that burns with a smoky yellow flame. Fixed carbon content: 46–86 per cent; calorific value: 1.93 × 107 – 3.63 × 107 J/kg
- black mountains — a mountain range running from N Monmouthshire and SE Powys (Wales) to SW Herefordshire (England). Highest peak: Waun Fach, 811 m (2660 ft)
- blasphemousness — the quality of being blasphemous
- blueback salmon — sockeye salmon.
- body mass index — A person's body mass index is a measurement that represents the relationship between their weight and their height.
- bohemian forest — a mountain range between the SW Czech Republic and SE Germany. Highest peak: Arber, 1457 m (4780 ft)
- boston marriage — (especially in 19th-century New England) an intimate friendship between two women often maintaining a household together.
- boston massacre — an outbreak (1770) in Boston against British troops, in which a few citizens were killed