13-letter words containing a, u, s, o
- atrabilarious — Characterized by melancholy or gloom.
- atroceruleous — a deep blue-black color.
- atrociousness — The state of being atrocious.
- auction house — a commercial company that specializes in selling items at auction
- audaciousness — Risky or daring behaviour.
- audiocassette — a cassette containing audiotape
- audiographics — audiographic teleconferencing
- augmentations — Plural form of augmentation.
- auguste comte — (Isidore) Auguste (Marie François) [ee-zee-dawr oh-gyst ma-ree frahn-swa] /i ziˈdɔr oʊˈgüst maˈri frɑ̃ˈswa/ (Show IPA), 1798–1857, French founder of the philosophical system of positivism.
- aum shinrikyo — a syncretistic Japanese cult combining elements of Buddhism, Hinduism, and Christianity, founded by Shoko Asahara in 1986; responsible for a number of murders and in particular a nerve-gas attack on the Tokyo underground in 1995
- austin dobson — (Henry) Austin, 1840–1921, English poet, biographer, and essayist.
- austroasiatic — a family of languages spoken in SE Asia and the landsaround the Bay of Bengal and consisting principally of Vietnamese, Khmer, Mon, Khasi, Nicobarese, and the Munda languages.
- authorisation — Alternative spelling of authorization.
- auto-destruct — self-destruct.
- autocatalyses — Third-person singular simple present indicative form of autocatalyse.
- autocatalysis — the catalysis of a reaction in which the catalyst is one of the products of the reaction
- autocatharsis — a therapeutic process designed to free unconscious disturbances by having the patient write about his or her experiences, impressions, etc.
- autocephalous — (of an Eastern Christian Church) governed by its own national synods and appointing its own patriarchs or prelates
- autochthonous — (of rocks, deposits, etc) found where they and their constituents were formed
- autodidactism — Alternative form of autodidacticism.
- autodigestion — (biology) The digestion of tissue by enzymes produced by the organism itself.
- autoeroticism — the arousal and use of one's own body as a sexual object, as through masturbation
- automechanism — an automatic mechanical system or component, especially a device that operates automatically under predetermined conditions.
- autoresponder — A program that automatically generates a set response to all messages sent to a particular e-mail address.
- autorickshaws — Plural form of autorickshaw.
- autoschediasm — anything done with little forethought or preparation
- autoschediaze — to do or act with little forethought or preparation
- autostability — the property of being stable either as a result of inherent characteristics or of built-in devices
- autotoxicosis — autointoxication.
- autumn crocus — a liliaceous plant, Colchicum autumnale, of Europe and N Africa having pink or purplish autumn flowers
- baba ghanoush — a thick purée of aubergines, tahini, olive oil, lemon juice, and garlic, originating in North Africa and the Mediterranean
- backgrounders — Plural form of backgrounder.
- balsamiferous — yielding or producing balsam
- bank discount — interest on a loan deducted from the principal amount when the loan is made and based on the loan's face value
- bank of issue — a bank, as a Federal Reserve Bank, empowered by a government to issue currency.
- banking hours — the hours during which a bank is open for business
- banking house — a more formal term for a bank
- barbarousness — The state or quality of being barbarous.
- barcoo salute — a movement of the hand to brush flies away from the face
- barosinusitis — aerosinusitis.
- battlegrounds — Plural form of battleground.
- be nuts about — to be greatly in love with
- beacon status — a ranking awarded by the government to an organization, rendering it eligible for extra funding, and aimed at encouraging organizations to share good practice with each other
- beauteousness — The state or quality of being beauteous.
- bibliolatrous — characterized by bibliolatry
- bignoniaceous — of, relating to, or belonging to the Bignoniaceae, a chiefly tropical family of trees, shrubs, and lianas, including jacaranda, bignonia, and catalpa
- bildungsroman — a novel concerned with a person's formative years and development
- blasphemously — uttering, containing, or exhibiting blasphemy; irreverent; profane.
- blood sausage — a kind of black sausage made from minced pork fat, pig's blood, and other ingredients
- bloody sunday — (in Northern Ireland) 30th January 1972, when British soldiers shot dead thirteen marchers in Londonderry who were protesting against the UK government's policy of internment