18-letter words containing t, i, f, o, r
- 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.
- smooth fox terrier — a breed of short-haired fox terrier with a mostly white, smooth coat.
- 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
- soldier of fortune — a person who independently seeks pleasure, wealth, etc., through adventurous exploits.
- sonic depth finder — a sonar instrument that uses echolocation to measure depths under water.
- spectrofluorimeter — an instrument in which the spectrum of secondarily emitted fluorescent light is used to identify chemical compounds.
- spirits of ammonia — a 10% solution of ammonia in alcohol
- squinting modifier — a word or phrase that can modify either the words that precede it or those that follow, as frequently in the sentence Studying frequently is tedious.
- standard of living — a grade or level of subsistence and comfort in everyday life enjoyed by a community, class, or individual: The well-educated generally have a high standard of living.
- standoff insulator — a type of insulator that supports an electrical conductor at a distance from other elements or surfaces.
- stirling's formula — a relation that approximates the value of n factorial (n!), expressed as .
- strait of magellan — a strait between the mainland of S South America and Tierra del Fuego, linking the S Pacific with the S Atlantic. Length: 600 km (370 miles). Width: up to 32 km (20 miles)
- straits of florida — a sea passage between the Florida Keys and Cuba, linking the Atlantic with the Gulf of Mexico
- sugarloaf mountain — a mountain in SE Brazil in Rio de Janeiro, at the entrance to Guanabara Bay. 1280 feet (390 meters).
- symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
- telford and wrekin — a unitary authority in W Central England, in Shropshire. Pop: 160 300 (2003 est). Area: 289 sq km (112 sq miles)
- territory of papua — a former territory of Australia, consisting of SE New Guinea and adjacent islands: now part of Papua New Guinea
- the bird has flown — the person in question has fled or escaped
- the first sea lord — the senior of the two serving naval officers who sits on the admiralty board of the Ministry of Defence
- think the world of — the earth or globe, considered as a planet.
- thorfinn karlsefni — 980–after 1007, Icelandic navigator, explorer, and leader of early colonizing expedition to Vinland, in North America.
- thrift-institution — economical management; economy; frugality.
- throw oneself into — to propel or cast in any way, especially to project or propel from the hand by a sudden forward motion or straightening of the arm and wrist: to throw a ball.
- tip of the iceberg — a large floating mass of ice, detached from a glacier and carried out to sea.
- to agree to differ — If two people who are arguing about something agree to disagree or agree to differ, they decide to stop arguing because neither of them is going to change their opinion.
- to be said for sth — If you say there is a lot to be said for something, you mean you think it has a lot of good qualities or aspects.
- to play favourites — to display favouritism
- to-ing and fro-ing — If you say that there is a lot of to-ing and fro-ing, you mean that the same actions or movements or the same arguments are being repeated many times.
- torsion-free group — a group in which every element other than the identity has infinite order.
- traffic controller — a person whose job is to control the flow of air traffic
- transmission shaft — a shaft that rotates transmitting motion from the engine to the differential gear
- 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.
- treasury of merits — the superabundant store of merits and satisfactions, comprising those of Christ, the Virgin Mary, and the saints.
- treaty of rijswijk — a treaty signed at Rijswijk in the Netherlands in 1697, ending the War of the Grand Alliance
- treaty of waitangi — a treaty signed in 1840 by Māori chiefs and a representative of the British Government, providing the basis for the British annexation of New Zealand
- 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
- tufted loosestrife — a primulaceous plant Naumburgia thyrsiflora
- tune someone grief — to annoy or harass someone
- turn in on oneself — to withdraw or cause to withdraw from contact with others and become preoccupied with one's own problems
- 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
- ultraviolet filter — a filter used on a lens to absorb ultraviolet radiation that may impart an undesirable blue cast to a photograph.
- under the aegis of — guided or protected by
- 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.
- uriniferous tubule — a urine-bearing tubule in a nephron of a kidney.
- visiting professor — a professor from another institution invited to teach at a university or college for a limited period, usually for a semester or one academic year.
- warrant of fitness — a six-monthly certificate required for motor vehicles certifying mechanical soundness
- water of hydration — the portion of a hydrate that is represented as, or can be expelled as, water: now usually regarded as being in true molecular combination with the other atoms of the compound, and not existing in the compound as water.