15-letter words containing m, e, o, r
- apartment block — building: flats, apartments
- apartment hotel — a hotel that rents furnished apartments or suites suitable for housekeeping, on a weekly or more permanent basis, and usually supplies all hotel services.
- apartment house — a building containing a number of residential apartments.
- apollo computer — (company) A company making workstations often used for CAD. From 1980 to 1987, Apollo were the largest manufacturer of network workstations. Apollo workstations ran Aegis, a proprietary operating system with a Posix-compliant Unix alternative frontend. Apollo's networking was particularly elegant, among the first to allow demand paging over the network, and allowing a degree of network transparency and low sysadmin-to-machine ratio that is still unmatched. Apollo's largest customers were Mentor Graphics (electronic design), GM, Ford, Chrysler, and Boeing (mechanical design). Apollo was acquired by Hewlett-Packard in 1989, and gradually closed down over the period 1990-1997.
- approximateness — The quality of being approximate.
- arc de triomphe — the triumphal arch in Paris begun by Napoleon I to commemorate his victories of 1805–6 and completed in 1836
- 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
- armour-piercing — capable of penetrating armour plate
- 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.
- assemblypersons — Plural form of assemblyperson.
- astrophotometry — the measurement of the intensity of light of celestial objects.
- at the mercy of — in the power of
- atmospherically — pertaining to, existing in, or consisting of the atmosphere: atmospheric vapors.
- augmented roman — a writing system based on an expanded English alphabet, consisting of 43 characters representing different phonemes of spoken English, used for teaching beginners to read. Abbreviation: I.T.A., i.t.a.
- automata theory — the formal study of the power of computation of abstract machines
- automatic drive — an automotive transmission requiring either very little or no manual shifting of gears.
- automatic rifle — a type of light machine gun capable of firing automatically or in single shots.
- autotransformer — a transformer in which part of the winding is common to both primary and secondary circuits
- azobisformamide — (chemistry) azodicarbonamide.
- ballroom dancer — a person who participates in ballroom dancing
- 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.
- bar examination — a written examination to determine if one is qualified to practice law in a particular jurisdiction.
- 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.
- barium chromate — a yellow, crystalline compound, BaCrO 4 , used as a pigment (barium yellow)
- barium peroxide — a gray-white powder, BaO2, used as a bleach and in making hydrogen peroxide
- barothermograph — an automatic instrument for recording pressure and temperature.
- 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
- bathroom scales — scales typically kept in a bathroom for people to weigh themselves
- bathythermogram — a record made by a bathythermograph.
- beam-power tube — a vacuum tube in which the stream of electrons flowing to the plate is focused by the action of a set of auxiliary, charged elements, giving an increase in output power.
- bear comparison — to be sufficiently similar in class or range to be compared with (something else), esp favourably
- bedroom slipper — a soft shoe worn in the house
- before the mast — as an apprentice seaman
- bergamot orange — a small Asian spiny rutaceous tree, Citrus bergamia, having sour pear-shaped fruit
- bevelled mirror — a mirror with a bevelled edge
- binomial series — an infinite series obtained by expanding a binomial raised to a power that is not a positive integer.
- biogeochemistry — the science of biological, chemical, and geological aspects of the environment
- bladder campion — a European caryophyllaceous plant, Silene vulgaris, having white flowers with an inflated calyx
- blenheim orange — a type of apple tree bearing gold-coloured apples
- blossom-end rot — a disease of tomato and pepper caused by a deficiency of calcium, characterized by decay at the blossom end of the fruit.
- bohemia-moravia — a former German protectorate including Bohemia and Moravia, 1939–45.
- 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