19-letter words containing r, e, f, n, c, a
- 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
- deflate compression — deflate
- 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 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.
- 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.
- effervescent tablet — Effervescent tablets break down quickly when they are dropped into water or another liquid.
- 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.
- 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.
- family practitioner — medical specialization in general practice, requiring training beyond that of general practice and leading to board certification.
- 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.
- feynman, richard p. — Richard P. Feynman
- 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.
- focal plane shutter — an opaque shield in a camera, lying in the focal plane of the lens, that, when tripped, admits light to expose the film or plate for a predetermined period, usually a fraction of a second
- focal-plane shutter — a camera shutter situated directly in front of the film.
- forensic accountant — an accountant who specializes in applying accountancy skills to the purposes of the law
- forensic psychiatry — the use of psychiatric knowledge and techniques in questions of law, as in determining legal insanity.
- fortification agate — an agate, used as a gem, having polygonal banding such that it suggests the plan of a bastion.
- fractal compression — (algorithm) A technique for encoding images using fractals.
- fractional currency — coins or paper money of a smaller denomination than the basic monetary unit.
- francesca da rimini — Francesca da, Francesca da Rimini.
- fraternal insurance — insurance underwritten by a fraternal society, under either a legal reserve plan or an assessment plan.
- free-market economy — an economy based on the free market system
- freezer compartment — in a refrigerator, an enclosed area kept at a temperature low enough to store frozen foods or freeze non-frozen foods
- french north africa — the former French possessions of Algeria, French Morocco, and Tunisia
- frill-necked lizard — a large arboreal insectivorous Australian lizard, Chlamydosaurus kingi, having an erectile fold of skin around the neck: family Agamidae (agamas)
- front-end financing — money or costs required or incurred in advance of a project in order to get it under way
- functional currency — Functional currency is the main currency used by a business.
- general post office — (in the U.S. postal system) the main post office of a city, county, etc., that also has branch post offices. Abbreviation: G.P.O., GPO.
- grandfather's chair — wing chair.
- grandfather's clock — a pendulum floor clock having a case as tall as or taller than a person; tall-case clock; long-case clock.
- great wall of china — a system of fortified walls with a roadway along the top, constructed as a defense for China against the nomads of the regions that are now Mongolia and Manchuria: completed in the 3rd century b.c., but later repeatedly modified and rebuilt. 2000 miles (3220 km) long.
- greenstick fracture — an incomplete fracture of a long bone, in which one side is broken and the other side is still intact.
- guerrilla financing — the use of unconventional and marginally legal means to capitalize enterprises
- gulf of carpentaria — a shallow inlet of the Arafura Sea, in N Australia between Arnhem Land and Cape York Peninsula
- halt and catch fire — (humour, processor) (HCF) Any of several undocumented and semi-mythical machine instructions with destructive side-effects, supposedly included for test purposes on several well-known architectures going as far back as the IBM 360. The Motorola 6800 microprocessor was the first for which an HCF opcode became widely known. This instruction caused the processor to read every memory location sequentially until reset.
- hyperfocal distance — the distance, at a given f number, between a camera lens and the nearest point (hyperfocal point) having satisfactory definition when focused at infinity.