12-letter words containing a, e, r, o
- art mobilier — small, movable art objects, especially primitive or prehistoric works of art.
- arteriograms — Plural form of arteriogram.
- arteriopathy — Any disease of the arteries.
- arthrobacter — a genus of rod-shaped or spherical bacteria found in the soil.
- arthroscopes — Plural form of arthroscope.
- arthrospores — an isolated vegetative cell that has passed into a resting state, occurring in bacteria and not regarded as a true spore.
- arthrotomies — Plural form of arthrotomy.
- artiodactyle — (zoology) One of the Artiodactyla, a group of ungulates.
- ash-coloured — silver-grey in colour
- aspect ratio — the ratio of width to height of the picture on a television or cinema screen
- assay groove — (in silverwork) a furrow left in a piece by the digging out of metal for assay.
- assertations — Plural form of assertation.
- assessorship — the occupation, post or duties of a person who assesses, advises, or estimates
- asseveration — the act of asseverating.
- assortedness — the position of being sorted, grouped or harmonized with, well or badly, or provided with a good or bad assortment or mixture
- astigmometer — an apparatus for measuring the degree of astigmatism.
- astrochemist — (chemistry, astronomy) A chemist or astronomer whose speciality is astrochemistry.
- astrogeology — the study of the structure, composition, and history of other planets and other bodies in the solar system
- asynchronies — a lack of synchronism or coincidence in time.
- at the worst — bad or ill in the highest, greatest, or most extreme degree: the worst person.
- atheoretical — having no connection with and not founded on theory
- atheromatous — a sebaceous cyst.
- atholl brose — a mixture of whisky and honey left to ferment before consumption
- atmospherics — Atmospherics are elements in something such as a piece of music or a book which create a certain atmosphere.
- atmospherium — an optical system used to simulate images of atmospheric phenomena, as cloud formations, storms, and day and night, on the inside of a dome.
- atom smasher — accelerator (sense 3)
- atomic power — nuclear power.
- attenborough — Sir David. born 1926, British naturalist and broadcaster; noted esp for his TV series Life on Earth (1978), The Living Planet (1983), The Life of Birds (1998), The Life of Mammals (2002), and First Life (2010)
- attorneyship — The office or profession of an attorney.
- au contraire — on the contrary
- auctioneered — Simple past tense and past participle of auctioneer.
- auger shower — a shower of electrons, photons, etc. resulting from the collision of primary cosmic rays with atomic nuclei in the atmosphere
- auroral zone — the region surrounding the north or south geomagnetic pole in which the auroral phenomena take place.
- austronesian — of or relating to Austronesia, its peoples, or their languages
- authorizable — able to be authorized
- auto-erotism — the arousal and satisfaction of sexual excitement within or by oneself, as by masturbation.
- autoanalyzer — any of various automatic devices that test and analyze chemicals, blood, etc.
- autochangers — Plural form of autochanger.
- autocritique — the examination of factors guiding one's thoughts, beliefs and actions; self-criticism
- autodestruct — likely to or possessing the power to destroy or obliterate itself or its possessor
- autodiallers — Plural form of autodialler.
- autoexposure — A device that sets the exposure automatically on a camera or other piece of equipment.
- autoinjector — A medical device designed to deliver a single dose of a particular, typically life-saving, drug.
- autoreactive — (immunology, medicine) Acting against the organism by which it was produced.
- averruncator — a long pair of shears used for pruning the higher branches of trees
- azathioprine — a synthetic drug that suppresses the normal immune responses of the body and is administered orally during and after organ transplantation and also in certain types of autoimmune disease. Formula: C9H7N7O2S
- baby brother — a younger brother
- baby-bouncer — a seat on springs suspended from a door frame, etc, in which a baby may be placed for exercise
- bachelor pad — a flat in which a bachelor lives
- bachelorette — A bachelorette is a woman who has never married.