18-letter words containing u, n, c, r
- selenium rectifier — a rectifier consisting of laminated plates of metal, usually iron, that have been coated with selenium on one side, with rectification taking place because the flow of electrons from the conductive metal to the selenium occurs more readily than the flow in the opposite direction.
- self-instructional — pertaining to or constituting learning materials and conditions arranged so that students can proceed to learn on their own with little or no supervision.
- self-preoccupation — the state of being preoccupied.
- semicircular canal — any of the three curved tubular canals in the labyrinth of the ear, associated with the sense of equilibrium.
- semiprecious stone — See at semiprecious.
- sentence structure — syntax
- sexual intercourse — genital contact, especially the insertion of the penis into the vagina followed by orgasm; coitus; copulation.
- shotgun microphone — a directional microphone with a narrow-angle range of sensitivity.
- shrubby cinquefoil — a small shrub, Potentilla fruticosa, of the rose family, native to the Northern temperate region, having pinnate leaves and numerous, showy, bright-yellow flowers.
- shugart technology — Seagate Technology
- sickness insurance — a type of insurance which pays out if you become ill
- silvery cinquefoil — any of several plants belonging to the genus Potentilla, of the rose family, having yellow, red, or white five-petaled flowers, as P. reptans (creeping cinquefoil) of the Old World, or P. argentea (silvery cinquefoil) of North America.
- six-finger country — an isolated area considered as being inhabited by people who practise inbreeding
- sodium bicarbonate — a white, crystalline, water-soluble solid, in powder or granules, NaHCO 3 , usually prepared by the reaction of soda ash with carbon dioxide or obtained from the intermediate product of the Solvay process by purification: used chiefly in the manufacture of sodium salts, baking powder, and beverages, as a laboratory reagent, as a fire extinguisher, and in medicine as an antacid.
- sound spectrograph — an electronic device for recording a sound spectogram.
- southern cameroons — German Kamerun. a region in W Africa: a German protectorate 1884–1919; divided in 1919 into British and French mandates.
- specimen signature — a signature to be compared to an original signature in order to verify someone's identity
- squirting cucumber — a Mediterranean plant, Ecballium elaterium, of the gourd family, whose ripened fruit forcibly ejects the seeds and juice.
- standard schnauzer — schnauzer.
- store launch event — A store launch event is a special event, which publicizes the opening of a new store and at which discounts and free samples may be offered.
- student councillor — a student who is a member of a council or body representing the interests of students at a school, university or college
- sub-saharan africa — the region of Africa to the south of the Sahara desert
- submarine sandwich — a sandwich made with a long cylindrical bread roll
- subordinate clause — a clause that modifies the principal clause or some part of it or that serves a noun function in the principal clause, as when she arrived in the sentence I was there when she arrived or that she has arrived in the sentence I doubt that she has arrived.
- subsidiary company — a company whose controlling interest is owned by another company.
- subsistence farmer — a farmer who consumes most of the produce he grows, leaving little or nothing to be marketed
- sulfuric anhydride — sulfur trioxide.
- summary proceeding — a mode of trial authorized by statute to be held before a judge without the usual full hearing.
- superior vena cava — See under vena cava.
- supporting actress — an actress playing a supporting role
- surgical appliance — a specialized device used by somebody to relieve a particular medical condition
- survival mechanism — something you or your body does automatically, in order to survive in a dangerous or unpleasant situation
- symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
- take out insurance — take out insurance against something
- teacher evaluation — the process of vetting teachers to maintain teaching standards
- tertiary education — education, following secondary education at a school, at a college or university
- the general public — the people in a society; people in general
- the hunger marches — a number of processions by unemployed workers in the 1930s to protest against unemployment and deprivation
- the uncircumcision — the gentiles
- thermionic current — an electric current produced by the flow of thermions.
- thermoluminescence — phosphorescence produced by the heating of a substance.
- thermonuclear bomb — hydrogen bomb.
- thioarsenious acid — any of a group of hypothetical acids, H3AsS3, HAsS2, and H4As2S5, known only in the forms of their salts
- to close your mind — If you close your mind to something, you deliberately do not think about it or pay attention to it.
- to cross your mind — If you say that an idea or possibility never crossed your mind, you mean that you did not think of it.
- truck center plate — one of a pair of plates that fit together and support the body of a car on a truck, while allowing the truck to rotate with respect to the body. One plate (body center plate) is attached to the underside of the car body and the other (truck center plate) is part of the car truck.
- turn one's back on — the rear part of the human body, extending from the neck to the lower end of the spine.
- ultralow frequency — an electromagnetic wave with a frequency between 300 and 3000 hertz. Abbreviation: ULF, ulf.
- 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