20-letter words containing c, o, y, x
- antimony oxychloride — a white, water-insoluble powder, SbOCl, used chiefly in the manufacture of antimony salts.
- 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
- complex carbohydrate — a carbohydrate, as sucrose or starch, that consists of two or more monosaccharide units.
- deoxyribonucleotides — Plural form of deoxyribonucleotide.
- essential complexity — (programming) A measure of the "structuredness" of a program.
- iodochlorhydroxyquin — The drug clioquinol.
- microcrystalline wax — Microcrystalline wax is a wax used as a stiffening agent and as a coating agent for tablets and capsules.
- oxyacetylene welding — welding using an oxyacetylene burner
- peremptory exception — a plea in bar of an action.
- 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
- physical examination — an examination, usually by a physician, of a person's body in order to determine his or her state of health or physical fitness, as for military service or participation in a sport.
- to flex your muscles — If a group, organization, or country flexes its muscles, it does something to impress or frighten people, in order to show them that it has power and is considering using it.
- toxemia of pregnancy — an abnormal condition of pregnancy characterized by hypertension, fluid retention, edema, and the presence of protein in the urine.
- toxic shock syndrome — a rapidly developing, sometimes fatal infection characterized by sudden onset of fever, gastrointestinal upsets, a sunburnlike rash, and a drop in blood pressure: caused by a Staphylococcus aureus toxin and occurring especially in menstruating women using high-absorbency tampons. Abbreviation: TSS.
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