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13-letter words containing a, c, o, i

  • atomic number — the number of protons in the nucleus of an atom of an element
  • atomic theory — any theory in which matter is regarded as consisting of atoms, esp that proposed by John Dalton postulating that elements are composed of atoms that can combine in definite proportions to form compounds
  • atomic volume — the atomic weight (relative atomic mass) of an element divided by its density
  • atomic weapon — a weapon in which energy is provided by nuclear fission
  • atomic weight — the weight of one atom of an element expressed in atomic mass units: it is the average weight of all the isotopes of the element
  • atomistically — Also called atomic theory. Philosophy. the theory that minute, discrete, finite, and indivisible elements are the ultimate constituents of all matter.
  • atrociousness — The state of being atrocious.
  • auction block — Also called block. a platform from which an auctioneer sells: the old courthouse where slaves were sold from the auction block.
  • auction house — a commercial company that specializes in selling items at auction
  • auction pitch — a variety of all fours in which players bid to determine the trump or pitch.
  • auctioneering — Present participle of auctioneer.
  • audaciousness — Risky or daring behaviour.
  • audience room — a room for holding formal interviews or hearings.
  • audiocassette — a cassette containing audiotape
  • audiographics — audiographic teleconferencing
  • aulic council — a council, founded in 1498, of the Holy Roman Emperor. It functioned mainly as a judicial body
  • 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.
  • autapomorphic — (biology) Describing any characteristic that has evolved in only a single species (or other taxon).
  • authenticator — a person or thing that authenticates.
  • auto-injector — An auto-injector is a hypodermic syringe that you can use to inject yourself with a liquid.
  • autocatalysis — the catalysis of a reaction in which the catalyst is one of the products of the reaction
  • autocatalytic — causing its own chemical reaction
  • autocatharsis — a therapeutic process designed to free unconscious disturbances by having the patient write about his or her experiences, impressions, etc.
  • autodidactism — Alternative form of autodidacticism.
  • autoeroticism — the arousal and use of one's own body as a sexual object, as through masturbation
  • autographical — Relating to, or used in, the process of autography.
  • autoinfection — infection by a pathogenic agent already within the body or infection transferred from one part of the body to another
  • automagically — automatically; in a way that is hidden from or not understood by the user, and in that sense, apparently “magical”: I downloaded an app that automagically adds a travel itinerary to my calendar whenever I buy a plane ticket.
  • automatically — without volition or from force of habit; mechanically: Whenever I hear that song, I automatically think of my dad.
  • automechanism — an automatic mechanical system or component, especially a device that operates automatically under predetermined conditions.
  • autonomically — autonomous.
  • autorickshaws — Plural form of autorickshaw.
  • autoschediasm — anything done with little forethought or preparation
  • autoschediaze — to do or act with little forethought or preparation
  • autotoxicosis — autointoxication.
  • averruncation — the act of averting or turning away
  • avila camacho — Manuel [mah-nwel] /mɑˈnwɛl/ (Show IPA), 1897–1955, president of Mexico 1940–46.
  • avocationally — in one's leisure time
  • axiomatically — pertaining to or of the nature of an axiom; self-evident; obvious.
  • bachelor girl — a young unmarried woman, esp one who is self-supporting
  • bacillophobia — The fear of microbes. Also known as germaphobia.
  • back emission — the secondary emission of electrons from an anode
  • back mutation — the reversion of a mutant to the original phenotype
  • backbone site — A key Usenet, electronic mail and/or Internet site; one that processes a large amount of third-party traffic, especially if it is the home site of any of the regional coordinators for the Usenet maps. Notable backbone sites as of early 1993 include uunet and the mail machines at Rutgers University, UC Berkeley, DEC's Western Research Laboratories, Ohio State University and the University of Texas. Compare rib site, leaf site.
  • backformation — Alternative spelling of back-formation.
  • backgrounding — Present participle of background.
  • backing group — a group of musicians providing an instrumental or vocal accompaniment for a pop singer
  • backing store — a computer storage device, usually a disk, that provides additional storage space for information so that it can be accessed and referred to when required and may be copied into the processor if needed
  • backwardation — the difference between the spot price for a commodity, including rent and interest, and the forward price
  • bacteriocidal — Alternative spelling of bactericidal.
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