15-letter words containing o, m, i
- 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.
- arc de triomphe — the triumphal arch in Paris begun by Napoleon I to commemorate his victories of 1805–6 and completed in 1836
- arch of triumph — Arc de Triomphe.
- aristotelianism — a philosophical tradition based on the wide-ranging belief system of Aristotle
- 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.
- arrondissements — Plural form of arrondissement.
- 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
- 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.
- atomic cocktail — an aqueous solution of radioactive substance administered orally as part of the treatment for cancer
- audio equipment — electrical devices used to play or record sound
- autocannibalism — The eating of part of one's own body.
- autocollimation — the process used in an autocollimator.
- autodidacticism — any self-directed learning or self-education
- automatic drive — an automotive transmission requiring either very little or no manual shifting of gears.
- 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
- automatic pilot — An automatic pilot or an autopilot is a device in an aircraft that automatically keeps it on a particular course.
- automatic rifle — a type of light machine gun capable of firing automatically or in single shots.
- automorphically — in an automorphic manner
- autorhythmicity — The quality of being autorhythmic, or generating its own rhythm, as for example the cells of the cardiac muscle do.
- axiom of choice — the axiom of set theory that given any collection of disjoint sets, a set can be so constructed that it contains one element from each of the given sets.
- azobisformamide — (chemistry) azodicarbonamide.
- azuchi-momoyama — a period of Japanese art, 1568–1600, characterized by construction of imposing, elegant castles and small, unadorned teahouses, lavish decorative arts, and bright-colored painting.
- baconian method — induction (def 4a).
- badminton court — the court on which games of badminton are played
- ball ammunition — live small-arms ammunition
- 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
- 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.
- be of two minds — to be undecided or irresolute
- 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
- bevelled mirror — a mirror with a bevelled edge
- bide one's time — to wait patiently for an opportunity
- billings method — a natural method of birth control that involves examining the colour and viscosity of the cervical mucus to discover when ovulation is occurring
- binomial series — an infinite series obtained by expanding a binomial raised to a power that is not a positive integer.
- bioaccumulation — the process in which industrial waste, toxic chemicals, etc. gradually accumulate in living tissue
- biogeochemistry — the science of biological, chemical, and geological aspects of the environment
- bioluminescence — the production of light by living organisms as a result of the oxidation of a light-producing substance (luciferin) by the enzyme luciferase: occurs in many marine organisms, insects such as the firefly, etc