20-letter words containing i, x, o, r, a
- aids-related complex — a condition that may develop into AIDS, characterized by the enlargement of the lymph nodes
- algebraic expression — a symbol or a combination of symbols used in algebra, containing one or more numbers, variables, and arithmetic operations: how to solve algebraic expressions.
- all-ordinaries index — an index of share prices on the Australian Stock Exchange giving a weighted arithmetic average of 245 ordinary shares
- antimony oxychloride — a white, water-insoluble powder, SbOCl, used chiefly in the manufacture of antimony salts.
- asexual reproduction — reproduction, as budding, fission, or spore formation, not involving the union of gametes.
- auxiliary power unit — an additional engine fitted to an aircraft to operate when the main engines are not in use
- axiomatic set theory — (theory) One of several approaches to set theory, consisting of a formal language for talking about sets and a collection of axioms describing how they behave. There are many different axiomatisations for set theory. Each takes a slightly different approach to the problem of finding a theory that captures as much as possible of the intuitive idea of what a set is, while avoiding the paradoxes that result from accepting all of it, the most famous being Russell's paradox. The main source of trouble in naive set theory is the idea that you can specify a set by saying whether each object in the universe is in the "set" or not. Accordingly, the most important differences between different axiomatisations of set theory concern the restrictions they place on this idea (known as "comprehension"). NBG (von Neumann-Bernays-Goedel) set theory sort of allows comprehension for all formulae without restriction, but distinguishes between two kinds of set, so that the sets produced by applying comprehension are only second-class sets. NBG is exactly as powerful as ZF, in the sense that any statement that can be formalised in both theories is a theorem of ZF if and only if it is a theorem of ZFC. MK (Morse-Kelley) set theory is a strengthened version of NBG, with a simpler axiom system. It is strictly stronger than NBG, and it is possible that NBG might be consistent but MK inconsistent. ML ("Modern Logic") is to NF as NBG is to ZF. (Its name derives from the title of the book in which Quine introduced an early, defective, form of it). It is stronger than ZF (it can prove things that ZF can't), but if NF is consistent then ML is too.
- basic oxygen process — a process for refining steel in which oxygen is blown into the molten iron
- benzene hexachloride — a compound, C6H6Cl6, used as an insecticide
- bernard of clairvaux — Saint. ?1090–1153, French abbot and theologian, who founded the stricter branch of the Cistercians in 1115
- bomb disposal expert — an expert in bomb disposal
- codex juris canonici — the official code of canon law in force in the Roman Catholic Church; introduced in 1918 and revised in 1983
- colonial experiencer — affluent young Englishman who gained experience of farming, etc in colonial Australia
- coordination complex — one of a number of complex compounds in which an atom or group of atoms is bound to the central atom by a shared pair of electrons supplied by the coordinated group and not by the central atom
- depreciation expense — A depreciation expense is the amount deducted from gross profit to allow for a reduction in the value of something because of its age or how much it has been used.
- entrance examination — admission test
- epitaxial transistor — a transistor made by depositing a thin pure layer of semiconductor material (epitaxial layer) onto a crystalline support by epitaxy. The layer acts as one of the electrode regions, usually the collector
- external respiration — exchange of oxygen and carbon dioxide across external or respiratory surfaces, as gills or lungs, in multicellular organisms
- fixed action pattern — a highly stereotyped pattern of behavior that is characteristic of a particular species.
- fixed-price contract — a contract in which the price is preset and invariable, regardless of the actual costs of production.
- hexafluoroantimonate — (inorganic chemistry) The anion SbF6- or any salt containing this anion; it is used as an acidic catalyst in epoxide opening reactions.
- in the lap of luxury — If you say that someone lives in the lap of luxury, you mean that they live in conditions of great comfort and wealth.
- income tax inspector — a person whose job is to assess individuals' income tax liability
- information exchange — discussion that involves exchanging ideas and knowledge
- linear extrapolation — Statistics, Mathematics. extrapolation using a linear equation to estimate the value of a variable or function outside the tabulated or observed range.
- mail exchange record — (messaging) (MX Record) A DNS resource record type that says which SMTP server handles electronic mail for a particular domain. E.g. the MX record foo.co.uk. 1054 IN MX 10 mail.foo.co.uk. means that mail for an address like "[email protected]" should be sent to "mail.foo.co.uk". There can be several servers for a domain. The "10" is a priority - the server with the lowest number will be tried first.
- mannitol hexanitrate — a colorless, crystalline, water-insoluble, explosive solid, C 6 H 8 N 6 O 1 8 , used as a fulminating agent in percussion caps and in the treatment of hypertension and coronary insufficiency.
- menstrual extraction — an abortion procedure involving suction aspiration of the uterine contents early in gestation, before the first missed menstrual period: sometimes performed later.
- microcrystalline wax — Microcrystalline wax is a wax used as a stiffening agent and as a coating agent for tablets and capsules.
- organization expense — the costs associated with organizing a business entity and bringing it into existence
- pappus of alexandria — 3rd century bc, Greek mathematician, whose eight-volume Synagoge is a valuable source of information about Greek mathematics
- parataxic distortion — a distortion in perception, especially of interpersonal relationships, based on a tendency to perceive others in accordance with a pattern determined by previous experiences.
- peroxyacetyl nitrate — an unstable nitrogen compound, found in certain types of smog, that is an irritant, esp. to the eyes and to plants
- peroxysulphuric acid — a white hygroscopic crystalline unstable oxidizing acid. Formula: H2SO5
- réseaux ip européens — (RIPE) A collaboration between European networks which use the TCP/IP protocol suite to provide Internet services.
- sex change operation — a surgical operation designed to change a person's physical sexual characteristics to those of the opposite sex
- to go the extra mile — If you say that someone is willing to go the extra mile, you mean that they are willing to make a special effort to do or achieve something.
- toxemia of pregnancy — an abnormal condition of pregnancy characterized by hypertension, fluid retention, edema, and the presence of protein in the urine.
- trailing vortex drag — drag arising from vortices that occur behind a body moving through a gas or liquid
- uranium hexafluoride — a colorless, water-insoluble, crystalline, volatile solid, UF 6 , used in its gaseous state in separating uranium 235 from uranium.
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