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21-letter words containing f, e, t, l

  • differential analyzer — an analog computer designed for solving certain differential equations.
  • differential calculus — the branch of mathematics that deals with differentials and derivatives.
  • differential equation — an equation involving differentials or derivatives.
  • 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.
  • differential operator — a function, usually expressed as a polynomial, that indicates linear combinations of the derivatives of the expression on which it operates.
  • differential quotient — derivative (def 6).
  • differential topology — the branch of topology that studies the properties of differentiable manifolds that remain invariant under diffeomorphisms.
  • differential windlass — a pair of hoisting drums of different diameter turning at the same rate, such that a pulley suspended below them on a line wound on the larger drum and unwound from the smaller drum is raised with mechanical advantage.
  • differential-quotient — something that has been derived.
  • downhole safety valve — A downhole safety valve is a piece of safety equipment used inside a well, which isolates wellbore pressure and fluid if something bad happens.
  • electric flux density — Electric flux density is electric flux passing through a unit area perpendicular to the direction of the flux.
  • electromagnetic field — a field of force associated with a moving electric charge equivalent to an electric field and a magnetic field at right angles to each other and to the direction of propagation
  • eyes right (or left) — a command to snap the head to the right (or left) while marching, as a salute when passing in review
  • faculty board meeting — a meeting of the governing body of a faculty
  • fall ill/be taken ill — If you fall ill or are taken ill, you suddenly become ill.
  • fermat's last theorem — the unproved theorem that the equation xn + yn = zn has no solution for x, y, z nonzero integers when n is greater than 2.
  • ferric sodium oxalate — an emerald-green, crystalline, extremely water-soluble salt, used in photography and blueprinting.
  • file allocation table — (file system)   (FAT) The component of an MS-DOS or Windows 95 file system which describes the files, directories, and free space on a hard disk or floppy disk. A disk is divided into partitions. Under the FAT file system each partition is divided into clusters, each of which can be one or more sectors, depending on the size of the partition. Each cluster is either allocated to a file or directory or it is free (unused). A directory lists the name, size, modification time and starting cluster of each file or subdirectory it contains. At the start of the partition is a table (the FAT) with one entry for each cluster. Each entry gives the number of the next cluster in the same file or a special value for "not allocated" or a special value for "this is the last cluster in the chain". The first few clusters after the FAT contain the root directory. The FAT file system was originally created for the CP/M[?] operating system where files were catalogued using 8-bit addressing. MS DOS's FAT allows only 8.3 filenames. With the introduction of MS-DOS 4 an incompatible 16-bit FAT (FAT16) with 32-kilobyte clusters was introduced that allowed partitions of up to 2 gigabytes. Microsoft later created FAT32 to support partitions larger than two gigabytes and pathnames greater that 256 characters. It also allows more efficient use of disk space since clusters are four kilobytes rather than 32 kilobytes. FAT32 was first available in OEM Service Release 2 of Windows 95 in 1996. It is not fully backward compatible with the 16-bit and 8-bit FATs. Compare: NTFS.
  • file service protocol — (protocol)   (FSP) A protocol, similar to FTP, for copying files between computers. It's designed for anonymous archives, and has protection against server and network overloading. It doesn't use connections so it can survive interruptions in service. Until 1993-08-12, FSP didn't stand for anything. Wen-King was responsible for the initials and Michael Grubb <[email protected]> for their eventual expansion. Other suggestions were "File Slurping Protocol", "Flaky Stream Protocol" and "FTP's Sexier Partner".
  • financial times index — one of the indexes of share prices produced by the Financial Times, especially the Financial Times Stock Exchange 100 Index
  • financial underwriter — A financial underwriter is an insurance employee working in financial underwriting.
  • first-dollar coverage — insurance that provides payment for the full loss up to the insured amount with no deductibles.
  • five civilized tribes — the Cherokees, Chickasaws, Choctaws, Creeks, and Seminoles of the Indian Territory
  • 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.
  • flip someone the bird — give someone the finger (see phrase under finger)
  • flotation compartment — in a boat, an enclosed section filled with air or gas to give buoyancy
  • flowering wintergreen — fringed polygala.
  • forensic anthropology — the branch of physical anthropology in which anthropological data, criteria, and techniques are used to determine the sex, age, genetic population, or parentage of skeletal or biological materials in questions of civil or criminal law.
  • fort lesley j. mcnair — a military reservation in SW Washington, D.C., on the Potomac River, SW of the Capitol.
  • four-footed butterfly — any of several butterflies of the family Nymphalidae, including the fritillaries, mourning cloaks, anglewings, and commas, characterized by reduced, nonfunctional forelegs.
  • fractional extraction — Fractional extraction is a process of extracting a liquid from a liquid, in which two solutes are separated, with one leaving in the extract and one in the raffinate.
  • franco-belgian system — French system.
  • fraudulent conversion — conversion committed with the intent to defraud
  • free-floating anxiety — chronic anxiety occurring for no identifiable cause
  • fuel injection engine — and engine with a system for introducing atomized liquid fuel under pressure directly into the combustion chambers of an internal-combustion engine without the use of a carburettor
  • full faith and credit — the obligation under Article IV of the U.S. Constitution for each state to recognize the public acts, records, and judicial proceedings of every other state.
  • functional dependency — (database)   Given a relation R (in a relational database), attribute Y of R is functionally dependent on attribute X of R and X of R functionally determines Y of R (in symbols R.X -> R.Y) if and only if each X in R has associated with it precisely one Y in R (at any one time). Attributes X and Y may be composite. This is very close to a function in the mathematical sense.
  • functional illiterate — a person with some basic education who still falls short of a minimum standard of literacy or whose reading and writing skills are inadequate to everyday needs.
  • functional imperative — a requirement for the survival of any social system, as communication, control of conflict, or socialization.
  • fundamental frequency — the lowest frequency at which a medium will freely oscillate.
  • general of the armies — a special rank held by John J. Pershing, equivalent to general of the army.
  • genetic amplification — an increase in the frequency of replication of a DNA segment.
  • gentleman of the road — a highwayman.
  • glen of imaal terrier — a strongly-built medium-sized variety of terrier with a medium-length coat and short forelegs
  • grammatical inference — Deducing a grammar from given examples. Also known as "inductive inference" and recently as "computational learning".
  • horns and halo effect — a tendency to allow one's judgement of another person, esp in a job interview, to be unduly influenced by an unfavourable (horns) or favourable (halo) first impression based on appearances
  • hubble classification — a method of classifying galaxies depending on whether they are elliptical, spiral, barred spiral, or irregular
  • in (or out of) place — in (or out of) the customary, proper, or assigned place
  • infant mortality rate — number of babies dying
  • infant welfare clinic — a medical facility that specializes in the health and well-being of young babies
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