19-letter words containing f, l, u, r
- radioactive fallout — the settling to the ground of airborne particles ejected into the atmosphere from the earth by explosions, eruptions, forest fires, etc., especially such settling from nuclear explosions (radioactive fallout) Compare rainout.
- reciprocity failure — a failure of the two exposure variables, light intensity and exposure time, to behave in a reciprocal fashion at very high or very low values
- reflux oesophagitis — inflammation of the gullet caused by regurgitation of stomach acids, producing heartburn: may be associated with a hiatus hernia
- republic of ireland — John, 1838–1918, U.S. Roman Catholic clergyman and social reformer, born in Ireland: archbishop of St. Paul, Minn., 1888–1918.
- republic of letters — the collective body of literary people.
- republic of vietnam — the name (from 1955–75) for South Vietnam, as an independent republic, following the division of the country in 1954 into North Vietnam and South Vietnam
- respiratory failure — a condition in which the respiratory system is unable to provide an adequate supply of oxygen or to remove carbon dioxide efficiently
- reticular formation — a network of neurons in the brainstem involved in consciousness, regulation of breathing, the transmission of sensory stimuli to higher brain centers, and the constantly shifting muscular activity that supports the body against gravity.
- right-eyed flounder — any of several flatfishes of the family Pleuronectidae, having both eyes on the right side of the head.
- ruffini's corpuscle — an end organ of certain sensory neurons that branches out parallel to the skin and responds to steady pressure.
- rural free delivery — former name for rural delivery service. Abbreviation: R.F.D.
- sea of tranquillity — Astronomy. Mare Tranquillitatis.
- self-congratulating — the expression or feeling of uncritical satisfaction with oneself or one's own accomplishment, good fortune, etc.; complacency.
- self-congratulation — the expression or feeling of uncritical satisfaction with oneself or one's own accomplishment, good fortune, etc.; complacency.
- self-congratulatory — the expression or feeling of uncritical satisfaction with oneself or one's own accomplishment, good fortune, etc.; complacency.
- self-reconstruction — an act of reconstructing.
- seminiferous tubule — any of the coiled tubules of the testis in which spermatozoa are produced.
- sharp-focus realism — photorealism.
- sir wilfrid laurier — Sir Wilfrid [wil-frid;; French weel-freed] /ˈwɪl frɪd;; French wilˈfrid/ (Show IPA), 1841–1919, Canadian statesman: prime minister 1896–1911.
- sodium hydrosulfite — a white, crystalline, water-soluble powder, Na 2 S 2 O 4 , used as a reducing agent, especially in dyeing, and as a bleach.
- soft-shelled turtle — any of numerous aquatic turtles of the family Trionychidae, inhabiting North America, Asia, and Africa, having the shell covered with flexible, leathery skin instead of horny plates.
- solid of revolution — a three-dimensional figure formed by revolving a plane area about a given axis.
- specular reflection — Specular reflection is reflection of heat or light in which the angles of different parts of the surface are important.
- sphere of influence — any area in which one nation wields dominant power over another or others.
- sugar loaf mountain — a mountain in SE Brazil in Rio de Janeiro, at the entrance to Guanabara Bay. 1280 feet (390 meters).
- sulfureted hydrogen — hydrogen sulfide.
- supercritical fluid — A supercritical fluid is a fluid at a temperature and pressure at which there is no difference between liquid and gas.
- term life insurance — life insurance for which premiums are paid over a limited time and that covers a specific term, the face value payable only if death occurs within that term.
- tetrafluoroethylene — a colorless, water-insoluble, flammable gas, C 2 F 4 , used in the synthesis of certain polymeric resins, as Teflon.
- to come full circle — If you say that you have come full circle or have turned full circle, you mean that after a long series of events or changes the same situation that you started with still exists.
- to follow your nose — If you follow your nose to get to a place, you go straight ahead or follow the most obvious route.
- to keep to yourself — If you keep to yourself, you stay on your own most of the time and do not mix socially with other people.
- traffic regulations — rules designed to expedite the flow of traffic and prevent collisions
- trifacial neuralgia — tic douloureux.
- trouble someone for — to ask someone to pass, hand, give, etc. (something) to one
- ultrahigh frequency — any frequency between 300 and 3000 megahertz. Abbreviation: UHF, uhf.
- unclassified degree — a degree that has not been given a grade because it is of a low standard
- under the influence — the capacity or power of persons or things to be a compelling force on or produce effects on the actions, behavior, opinions, etc., of others: He used family influence to get the contract.
- venus of willendorf — a village in NE Austria, near Krems: site of an Aurignacian settlement where a 4½ inches (11 cm) limestone statuette (Venus of Willendorf) was found.
- with flying colours — If you pass a test with flying colours, you have done very well in the test.
- wouldn't harm a fly — If you say that someone wouldn't hurt a fly or wouldn't harm a fly, you are emphasizing that they are very kind and gentle.
- xenon tetrafluoride — a colorless, crystalline compound, XeF 4 , prepared by heating a gaseous mixture of fluorine and xenon.
- yellowtail flounder — a righteyed flounder, Limanda ferruginea, inhabiting waters along the Atlantic coast of North America, having a yellowish tail fin and rusty-red spots on the body: once commercially important, now greatly reduced in number.