21-letter words containing etr
- complete metric space — (theory) A metric space in which every sequence that converges in itself has a limit. For example, the space of real numbers is complete by Dedekind's axiom, whereas the space of rational numbers is not - e.g. the sequence a[0]=1; a[n_+1]:=a[n]/2+1/a[n].
- cone penetration test — a method of testing soils by pressing a cone of standard dimensions into the soil under a known load and measuring the penetration
- differential geometry — the branch of mathematics that deals with the application of the principles of differential and integral calculus to the study of curves and surfaces.
- flat-coated retriever — one of an English breed of large sporting dogs having a flat, dense, shiny black or liver-colored coat, small ears, and long jaws, used for retrieving game from both water and land.
- geometric progression — a sequence of terms in which the ratio between any two successive terms is the same, as the progression 1, 3, 9, 27, 81 or 144, 12, 1, 1/12, 1/144.
- information retrieval — the systematic storage and recovery of data, as from a file, card catalog, or the memory bank of a computer. Abbreviation: IR.
- metropolitan district — any of the districts making up the metropolitan counties of England: since 1986 they have functioned as unitary authorities, forming the sole principal tier of local government. Each metropolitan district has an elected council responsible for education, social services, etc
- parametric statistics — the branch of statistics concerned with data measurable on interval or ratio scales, so that arithmetic operations are applicable to them, enabling parameters such as the mean of the distribution to be defined
- silicon tetrachloride — a colorless, fuming liquid, SiCl 4 , used chiefly for making smoke screens and various derivatives of silicon.
- silicon tetrafluoride — a colorless, fuming gas, SiF 4 , used chiefly in the manufacture of fluosilicic acid.
- skew symmetric matrix — a matrix that is equal to the negation of its transpose
- tetrabromofluorescein — eosin (def 1).
- twenty-two metre line — one of two lines on a rugby pitch which are twenty-two metres from the goal-line
- volumetric efficiency — the ratio of fluid delivered by a piston or ram pump per stroke to the displacement volume of the piston or ram
- wilson's storm petrel — a small petrel, Oceanites oceanicus, that breeds in the Southern Hemisphere but ranges into the North Atlantic and Pacific oceans.
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