17-letter words containing o, a, r, f, i, s
- sufficient reason — the principle that nothing happens by pure chance, but that an explanation must always be available
- teaching software — computer software for use in providing online education
- temple of artemis — the temple at Ephesus dedicated to Artemis.
- the bag of tricks — every device; everything
- the carboniferous — the Carboniferous period or rock system
- thermal diffusion — the separation of constituents, often isotopes, of a fluid under the influence of a temperature gradient.
- thiosulfuric acid — an acid, H 2 S 2 O 3 , that may be regarded as sulfuric acid with one oxygen atom replaced by sulfur.
- thuringian forest — a forested mountain region in central Germany: a resort area.
- to raise the roof — If a group of people inside a building raise the roof, they make a very loud noise, for example by singing or shouting.
- traffic diversion — a special route arranged for traffic to follow when the normal route cannot be used
- transfer function — The transfer function of a circuit is the ratio of the response to the input.
- transformationist — transformist.
- transignification — (in the Eucharist) a change in the significance of the bread and wine to symbolize the body and blood of Christ.
- unclassified road — a road that has not been given a grade because it is of a basic standard
- uniformitarianism — supporting, conforming to, or derived from a theory or doctrine about uniformity, especially on the subject of geology.
- unofficial strike — a strike that is not approved by the strikers' trade union
- unprofessionalism — not professional; not pertaining to or characteristic of a profession.
- welfare economics — a branch of economics concerned with improving human welfare and social conditions chiefly through the optimum distribution of wealth, the relief or reduction of unemployment, etc.
- year of confusion — (in ancient Rome) the year of 445 days preceding the introduction, in 46 b.c., of the Julian calendar: lengthened to compensate for the cumulative errors of the Roman calendar.