18-letter words containing a, n, g, s, t, r
- ski-mountaineering — a combination of the sports of skiing and mountaineering, for example by climbing up a mountain then skiing down it
- skin friction drag — aerodynamic resistance or drag due to the contact of moving air with the surface of an airplane, a glider, etc.
- snake in the grass — a treacherous person, especially one who feigns friendship.
- societal marketing — marketing that takes into account society's long-term welfare
- something to spare — a surplus of something
- sound spectrograph — an electronic device for recording a sound spectogram.
- sow dragon's teeth — to take some action that is intended to prevent strife or trouble but that actually brings it about
- specimen signature — a signature to be compared to an original signature in order to verify someone's identity
- spherical triangle — a triangle formed by arcs of great circles of a sphere.
- stand one's ground — the solid surface of the earth; firm or dry land: to fall to the ground.
- stand-by generator — an electrical system which operates automatically in case the usual system malfunctions
- stand-by passenger — someone who buys a (usually cheaper) ticket, if they are still available, on a plane just before it is about to leave rather than booking in advance
- 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.
- 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.
- 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)
- strangeness number — a quantum number, designating the strangeness of an elementary particle, equivalent to the hypercharge minus the baryon number
- strathclyde region — a former local government region in W Scotland: formed in 1975 from Glasgow, Renfrewshire, Lanarkshire, Buteshire, Dunbartonshire, and parts of Argyllshire, Ayrshire, and Stirlingshire; replaced in 1996 by the council areas of Glasgow, Renfrewshire, East Renfrewshire, Inverclyde, North Lanarkshire, South Lanarkshire, Argyll and Bute, East Dunbartonshire, West Dunbartonshire, North Ayrshire, South Ayrshire, and East Ayrshire
- strong interaction — the interaction between gluons and between gluons and quarks that is responsible for the strong force.
- sugarloaf mountain — a mountain in SE Brazil in Rio de Janeiro, at the entrance to Guanabara Bay. 1280 feet (390 meters).
- super giant slalom — a slalom race in which the course is longer and has more widely spaced gates than in a giant slalom.
- supporting actress — an actress playing a supporting role
- sustaining program — a radio or television program without a commercial sponsor.
- swarm intelligence — the collective behaviour of a group of animals, esp social insects such as ants, bees, and termites, that are each following very basic rules
- sweet vernal grass — a Eurasian meadow grass, Anthoxanthum odoratum, found throughout North America, having clusters of brownish-green flowers.
- sweptwing aircraft — an aircraft which has wings that are swept (usually) backwards
- sympathetic string — a thin wire string, as in various obsolete musical instruments, designed to vibrate sympathetically with the bowed or plucked strings to reinforce the sound.
- system-programming — a program, as an operating system, compiler, or utility program, that controls some aspect of the operation of a computer (opposed to application program).
- technical sergeant — a noncommissioned officer ranking below a master sergeant and above a staff sergeant.
- the hunger marches — a number of processions by unemployed workers in the 1930s to protest against unemployment and deprivation
- the passenger seat — the seat used by a passenger of a car, beside the driver
- to scrape a living — If you say that someone scrapes a living or scratches a living, you mean that they manage to earn enough to live on, but it is very difficult. In American English, you say they scrape out a living or scratch out a living.
- transcendental ego — (in Kantian epistemology) that part of the self that is the subject and never the object.
- transfer passenger — a traveller who changes from one plane, train, or bus to another, or to another form of transport
- translation agency — an organization that provide people to translate speech or writing into a different language
- transmogrification — to change in appearance or form, especially strangely or grotesquely; transform.
- transporter bridge — a bridge for carrying passengers and vehicles by means of a platform suspended from a trolley.
- traveling salesman — a male representative of a business firm who travels in an assigned territory soliciting orders for a company's products or services.
- treaty obligations — obligations or duties that must be carried out by a party as according to a treaty they have entered into
- 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
- ultrasonic testing — the scanning of material with an ultrasonic beam, during which reflections from faults in the material can be detected: a powerful nondestructive test method
- ultrasonic welding — the use of high-energy vibration of ultrasonic frequency to produce a weld between two components which are held in close contact
- under the aegis of — guided or protected by
- under-registration — the act of registering.
- universal negative — a proposition of the form “No S is P.” Symbol: E, e.
- urban homesteading — homesteading (def 2).
- veterinary surgeon — Chiefly British. a veterinarian.
- virginia snakeroot — any of various plants whose roots have been regarded as a remedy for snakebites, as the herb Aristolochia serpentaria (Virginia snakeroot) having a medicinal rhizome and rootlets, and the white-flowered Polygala senega (Seneca snakeroot) having a medicinal root.
- voter registration — the requirement of citizens to become registered in order to vote
- wandering minstrel — travelling performer