17-letter words containing f, i, s, t, u, l
- spatial frequency — the measure of fine detail in an optical image in terms of cycles per millimetre
- speech difficulty — a problem encountered in speaking
- stannous fluoride — a white, crystalline powder, SnF 2 , slightly soluble in water: used as a source of fluorine in the prevention of dental caries, especially as a toothpaste additive.
- statue of liberty — a large copper statue, on Liberty Island, in New York harbor, depicting a woman holding a burning torch: designed by F. A. Bartholdi and presented to the U.S. by France; unveiled 1886.
- strike-slip fault — a geological fault on which the movement is along the strike of the fault
- the life and soul — a person regarded as the main source of merriment and liveliness
- 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.
- thistle butterfly — any nymphalid butterfly of the genus Vanessa, as the red admiral or painted lady.
- troilus butterfly — spicebush swallowtail.
- unofficial strike — a strike that is not approved by the strikers' trade union
- wallis and futuna — French overseas territory in the South Pacific, northeast of the Fiji Islands: it consists of two groups of islands (Wallis Islands and Futuna Islands): c. 106 sq mi (275 sq km); pop. 14,000