18-letter words containing r, u, f, i
- 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
- sugarloaf mountain — a mountain in SE Brazil in Rio de Janeiro, at the entrance to Guanabara Bay. 1280 feet (390 meters).
- sulfuric anhydride — sulfur trioxide.
- sunflower seed oil — the oil extracted from sunflower seeds, used as a salad oil, in the manufacture of margarine, etc
- symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
- territory of papua — a former territory of Australia, consisting of SE New Guinea and adjacent islands: now part of Papua New Guinea
- thrift-institution — economical management; economy; frugality.
- to play favourites — to display favouritism
- torsion-free group — a group in which every element other than the identity has infinite order.
- transfinite number — an infinite cardinal or ordinal number.
- treasury of merits — the superabundant store of merits and satisfactions, comprising those of Christ, the Virgin Mary, and the saints.
- 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
- 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.
- universal suffrage — suffrage for all persons over a certain age, usually 18 or 21, who in other respects satisfy the requirements established by law.
- university faculty — a division within a university comprising one subject area, or a number of related subject areas
- uriniferous tubule — a urine-bearing tubule in a nephron of a kidney.
- wildlife sanctuary — an area where wild animals and plants are protected
- wrongful dismissal — the act of making someone redundant for reasons which are illegal or unjust
- xenon hexafluoride — a colorless, crystalline compound, XeF 6 , that melts at 50°C to a yellow liquid, and boils at 75°C.
- zone of saturation — the ground below the water table