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19-letter words containing r, f, c

  • culler-fried system — A system for interactive mathematics.
  • cult of personality — a cult promoting adulation of a living national leader or public figure, as one encouraged by Stalin to extend his power.
  • current transformer — A current transformer is a transformer that is designed to give an accurate current ratio for the purpose of measurement and control.
  • customer preference — Customer preference is what type of product an individual customer likes and dislikes.
  • cyril of alexandria — Saint. ?375–444 ad, Christian theologian and patriarch of Alexandria. Feast day: June 27 or June 9
  • deacetyltransferase — (enzyme) Any of a class of enzymes that remove acetyl groups, especially from a lysine residue of a histone.
  • declaration of love — a statement made by one person to another in which they say they are in love with the other person
  • defence expenditure — the amount that a country spends on military measures or resources
  • deflate compression — deflate
  • dereliction of duty — Dereliction of duty is deliberate or accidental failure to do what you should do as part of your job.
  • developable surface — a surface that can be flattened onto a plane without stretching or compressing any part of it, as a circular cone.
  • diamond ring effect — a phenomenon, sometimes observed immediately before and after a total eclipse of the sun, in which one of Baily's beads is much brighter than the others, resembling a diamond ring around the moon.
  • dictionary of names — a dictionary of given names that indicates whether a name is usually male, female, or unisex and often includes origins as well as meanings; for example, as by indicating that Evangeline, meaning “good news,” comes from Greek. Used primarily as an aid in selecting a name for a baby, dictionaries of names may also include lists of famous people who have shared a name and information about its current popularity ranking.
  • difference equation — (mathematics)   A relation between consecutive elements of a sequence. The first difference is D u(n) = u(n+1) - u(n) where u(n) is the nth element of sequence u. The second difference is u(n+2) + a u(n+1) + b u(n) = 0 can be converted to a difference equation (in this case, a second order linear difference equation): D2 u(n) + p D u(n) + q u(n) = 0 and vice versa. a, b, p, q are constants.
  • differential backup — (operating system)   A kind of backup that copies all files that have changed since the last full backup. Each differential backup will include all files in previous differential backups since the full backup so to restore a version of a file, you only need to search the full backup and the relevant differential backup. Some systems support differential backup by associating an "Archive" flag with each file and setting this flag whenever the file is modified to indicate that it should be included in the next backup. A differential backup does not change this flag, whereas an incremental backup resets it.
  • diffraction grating — a band of equidistant, parallel lines, usually more than 5000 per inch (2000 per centimeter), ruled on a glass or polished metal surface for diffracting light to produce optical spectra.
  • diffraction pattern — the phenomenon exhibited by wave fronts that, passing the edge of an opaque body, are modulated, thereby causing a redistribution of energy within the front: it is detectable in light waves by the presence of a pattern of closely spaced dark and light bands (diffraction pattern) at the edge of a shadow.
  • digital certificate — (communications, security)   An attachment to an electronic mail message used for security purposes, e.g. to verify that a user sending a message is who he or she claims to be, and to provide the receiver with the means to encode a reply. An individual wishing to send an encrypted message applies for a digital certificate from a certificate authority (CA). The CA issues an encrypted digital certificate containing the applicant's public key and a variety of other identification information. The CA makes its own public key readily available on the Internet. The recipient of an encrypted message uses the CA's public key to decode the digital certificate attached to the message, verifies it as issued by the CA and then obtains the sender's public key and identification information held within the certificate.
  • director of studies — a member of staff at an educational institution who has responsibility for overseeing the curriculum
  • disciples of christ — a Christian denomination, founded in the U.S. by Alexander Campbell in the early part of the 19th century, that rejects all creeds, holds the Bible as a sufficient rule of faith and practice, administers baptism by immersion, celebrates the Lord's Supper every Sunday, and has a congregational polity.
  • disenfranchisements — Plural form of disenfranchisement.
  • distinctive feature — a feature of the sound system of a language that serves as the crucial distinguishing mark between two phonemes, as the distinctive feature of voicing, which distinguishes b from p in English, or nasality, which distinguishes m from b and p.
  • doctrine of descent — the theory that animals and plants arose by descent from previously existing organisms; theory of evolution
  • effervescent tablet — Effervescent tablets break down quickly when they are dropped into water or another liquid.
  • efficiency engineer — a person whose work is to increase the productive efficiency of a business or industry by finding better methods of performing various operations, reducing waste and costs, etc.
  • elastic deformation — In elastic deformation a material changes shape when a stress is applied to it but goes back to its original state when the stress is removed.
  • electromotive force — a source of energy that can cause a current to flow in an electrical circuit or device
  • electrostatic field — an electric field associated with static electric charges
  • engineering factory — a factory where engineering products are made
  • entry qualification — the qualifications and conditions required to join an organization, club, etc
  • essence of bergamot — a fragrant essential oil from the fruit rind of this plant, used in perfumery and some teas (including Earl Grey)
  • expeditionary force — An expeditionary force is a group of soldiers who are sent to fight in a foreign country.
  • experimenter effect — the influence of an experimenter's expectations on his results
  • factitious disorder — any of various syndromes, as Münchausen syndrome, characterized by physical or psychological symptoms intentionally produced by a person and under voluntary control.
  • family practitioner — medical specialization in general practice, requiring training beyond that of general practice and leading to board certification.
  • farmers cooperative — an organization of farmers for marketing their products or buying supplies.
  • fashion coordinator — a person in a department store or other establishment who coordinates activities centered upon or related to fashion, as fashion themes, shows, displays, and promotion.
  • fellow countrywoman — a fellow countrywoman is a female citizen of the same state as the person speaking, writing, or being referred to
  • female circumcision — clitoridectomy.
  • ferrite core memory — (storage)   (Or "core") An early form of non-volatile storage built (by hand) from tiny rings of magnetisable material threaded onto very fine wire to form large (e.g. 13"x13" or more) rectangluar arrays. Each core stored one bit of data. These were sandwiched between printed circuit boards(?). Sets of wires ran horizontally and vertically and where a vertical and horizontal wire crossed, a core had both wires threaded through it. A single core could be selected and magnetised by passing sufficient current through its horizontal and vertical wires. A core would retain its magnetisation until it was re-magnetised. The two possible polarities of magnetisation were used to represent the binary values zero and one. A third "sense" wire, passed through the core and, if the magnetisation of the core was changed, a small pulse would be induced in the sense wire which could be detected and used to deduce the core's original state. Some core memory was immersed in a bath of heated oil to improve its performance. Core memory was rendered obsolete by semiconductor memory. For example, the 1970s-era NCR 499 had two boards, each with 16 kilobytes of core memory.
  • feynman, richard p. — Richard P. Feynman
  • fighter-interceptor — a fighter plane used for the defense of a region against air attack, especially by attacking bombers.
  • finite differencing — strength reduction
  • first-sale doctrine — a legal principle allowing the purchaser of a lawfully made copy of a copyright-protected work to sell or give away that copy without permission but not to reproduce it.
  • fixed cost contract — a contract in which the costs do not vary
  • fixed exchange rate — finance: set rate of exchange
  • fixed-term contract — a contract for a particular and fixed period
  • fixed-wing aircraft — a heavier-than-air aircraft capable of flight whose lift is generated not by wing motion relative to the aircraft, but by forward motion through the air
  • flannelmouth sucker — a sucker, Catostomus latipinnis, of the Colorado River and its tributaries.
  • fluophosphoric acid — fluorophosphoric acid.
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