18-letter words containing r, f, c
- self-tapping screw — a screw designed to tap its corresponding female thread as it is driven.
- self-transcendence — the quality or state of being transcendent.
- senior aircraftman — a rank in the Royal Air Force comparable to that of a private in the army, though not the lowest rank in the Royal Air Force
- sense of direction — Your sense of direction is your ability to know roughly where you are, or which way to go, even when you are in an unfamiliar place.
- shrubby cinquefoil — a small shrub, Potentilla fruticosa, of the rose family, native to the Northern temperate region, having pinnate leaves and numerous, showy, bright-yellow flowers.
- sildenafil citrate — a white crystalline powder, C 22 H 30 N 6 O 4 S, that temporarily normalizes erectile function of the penis by blocking an enzyme known to inhibit the production of a chemical that causes erections: used in the form of a pill to treat impotence.
- silver certificate — a former paper currency first issued in 1878 by the U.S. federal government for circulation, equal to and redeemable for silver to a stated value.
- silvery cinquefoil — any of several plants belonging to the genus Potentilla, of the rose family, having yellow, red, or white five-petaled flowers, as P. reptans (creeping cinquefoil) of the Old World, or P. argentea (silvery cinquefoil) of North America.
- six-finger country — an isolated area considered as being inhabited by people who practise inbreeding
- sixth-form college — (in England and Wales) a college offering A-level and other courses to pupils over sixteen from local schools, esp from those that do not have sixth forms
- skin friction drag — aerodynamic resistance or drag due to the contact of moving air with the surface of an airplane, a glider, etc.
- society of friends — a Christian denomination, founded in England c. 1650 by George Fox, that has no formal creed, liturgy, or priesthood and rejects violence in human relations, esp. warfare
- software backplane — (programming, tool) A CASE framework from Atherton.
- sonic depth finder — a sonar instrument that uses echolocation to measure depths under water.
- specrate_base_fp92 — (benchmark) A variant of SPECrate_fp92 that reports "baseline" results, using stricter run rules.
- spectrofluorimeter — an instrument in which the spectrum of secondarily emitted fluorescent light is used to identify chemical compounds.
- spectrofluorometer — an instrument in which the spectrum of secondarily emitted fluorescent light is used to identify chemical compounds.
- spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
- state of emergency — If a government or other authority declares a state of emergency in an area, it introduces special measures such as increased powers for the police or army, usually because of civil disorder or because of a natural disaster such as an earthquake.
- street certificate — a certificate showing ownership of a specified number of shares of stock: endorsed by the owner and guaranteed by a broker, it may be traded without formal transfer on the books of the corporation issuing the stock.
- structural formula — a chemical formula showing the linkage of the atoms in a molecule diagrammatically, as H–O–H.
- sub-saharan africa — the region of Africa to the south of the Sahara desert
- subsistence farmer — a farmer who consumes most of the produce he grows, leaving little or nothing to be marketed
- sulfuric anhydride — sulfur trioxide.
- surface-to-surface — (of a missile, message, etc.) capable of traveling from a base on the surface of the earth to a target also on the surface.
- sweptwing aircraft — an aircraft which has wings that are swept (usually) backwards
- symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
- terms of reference — Terms of reference are the instructions given to someone when they are asked to consider or investigate a particular subject, telling them what they must deal with and what they can ignore.
- the french riviera — the Mediterranean coastal region of France from Cannes eastward to Italy
- theater of cruelty — a form of surrealist theater originated by Antonin Artaud and emphasizing the cruelty of human existence by portraying sadistic acts and intense suffering.
- theatre of cruelty — a type of theatre advocated by Antonin Artaud in Le Théâtre et son double that seeks to communicate to its audience a sense of pain, suffering, and evil, using gesture, movement, sound, and symbolism rather than language
- thermal efficiency — the ratio of the work output of a heat engine to the heat input expressed in the same units of energy.
- tip of the iceberg — a large floating mass of ice, detached from a glacier and carried out to sea.
- to fall from grace — If someone falls from grace, they suddenly stop being successful or popular.
- too clever by half — If someone is too clever by half, they are very clever and they show their cleverness in a way that annoys other people.
- traffic controller — a person whose job is to control the flow of air traffic
- transmogrification — to change in appearance or form, especially strangely or grotesquely; transform.
- transrectification — rectification occurring in one circuit as a result of the application of an alternating voltage to another circuit.
- triangle of forces — a triangle whose sides represent the magnitudes and directions of three forces whose resultant is zero and which are therefore in equilibrium
- two-tier financing — a form of lending in which the debt is divided into two separate parts, as in a first and second mortgage held by an individual on a single property
- ultralow frequency — an electromagnetic wave with a frequency between 300 and 3000 hertz. Abbreviation: ULF, ulf.
- unfair competition — acts done by a seller to confuse or deceive the public with intent to acquire a larger portion of the market, as by cutting prices below cost, misleading advertising, selling a spurious product under a false identity, etc.
- unification church — a religious sect that combines elements of Protestantism and Buddhism, founded by the Rev. Sun Myung Moon in 1954: many of its members live in communes sponsored by the sect.
- university faculty — a division within a university comprising one subject area, or a number of related subject areas
- ur of the chaldees — the city where Abraham was born, sometimes identified with the Sumerian city of Ur. Gen. 11:28, 31; 15:7; Neh. 9:7.
- vermilion rockfish — a scarlet-red rockfish, Sebastes miniatus, inhabiting waters along the Pacific coast of North America, important as a food fish.
- very low frequency — any frequency between 3 and 30 kilohertz. Abbreviation: VLF.
- vicar of wakefield — a novel (1766) by Goldsmith.
- video conferencing — the holding of videoconferences.
- weak nuclear force — weak interaction