| radiotelegraph | (noun) the use of radio to send telegraphic messages (usually by Morse code) | Synonyms: radiotelegraphy, wireless telegraph, wireless telegraphy |
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| (noun) telegraphy that uses transmission by radio rather than by wire | Synonyms: radiotelegraphy, wireless telegraphy |
| radiotelegraphy | (noun) the use of radio to send telegraphic messages (usually by Morse code) | Synonyms: radiotelegraph, wireless telegraph, wireless telegraphy |
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| (noun) telegraphy that uses transmission by radio rather than by wire | Synonyms: radiotelegraph, wireless telegraphy |
| regress | (noun) returning to a former state | Synonyms: regression, retrogression, retroversion, reversion |
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| (noun) the reasoning involved when you assume the conclusion is true and reason backward to the evidence | Synonyms: reasoning backward |
| regression | (noun) returning to a former state | Synonyms: regress, retrogression, retroversion, reversion |
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| (noun) the relation between selected values of x and observed values of y (from which the most probable value of y can be predicted for any value of x) | Synonyms: regression toward the mean, simple regression, statistical regression |
| (noun) (psychiatry) a defense mechanism in which you flee from reality by assuming a more infantile state | - |
| (noun) an abnormal state in which development has stopped prematurely | Synonyms: arrested development, fixation, infantile fixation |
| regret | (noun) sadness associated with some wrong done or some disappointment | Synonyms: rue, ruefulness, sorrow |
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| regrets | (noun) a polite refusal of an invitation | Synonyms: declination |
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| retrogression | (noun) returning to a former state | Synonyms: regress, regression, retroversion, reversion |
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| (noun) passing from a more complex to a simpler biological form | Synonyms: degeneration |
| ribgrass | (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: buckthorn, English plantain, narrow-leaved plantain, Plantago lanceolata, ribwort, ripple-grass |
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| ricegrass | (noun) any grass of the genus Oryzopsis | Synonyms: rice grass |
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| roentgenogram | (noun) a radiogram made by exposing photographic film to X rays; used in medical diagnosis | Synonyms: X-ray, X-ray photograph, X-ray picture, X ray |
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| roentgenography | (noun) radiography that uses X-rays to produce a roentgenogram | Synonyms: X-ray photography |
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| rotogravure | (noun) using photography to produce a plate for printing | Synonyms: photogravure |
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| (noun) printing by transferring an image from a photogravure plate to a cylinder in a rotary press | - |
| (noun) printed material (text and pictures) produced by an intaglio printing process in a rotary press | - |
| ryegrass | (noun) any of several annual or perennial Eurasian grasses | Synonyms: rye grass |
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| sandgrouse | (noun) pigeon-like bird of arid regions of the Old World having long pointed wings and tail and precocial downy young | Synonyms: sand grouse |
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| sangria | (noun) sweetened red wine and orange or lemon juice with soda water | Synonyms: sangaree |
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| scapegrace | (noun) a reckless and unprincipled reprobate | Synonyms: black sheep |
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| scintigram | (noun) a recording of the radioactivity emitted by a tracer in an organism or organ system. | - |
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| scintigraph | (noun) The apparatus used to make a scintigram. | Synonyms: scintiscanner |
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| seagrass | (noun) any of various seaweeds that grow underwater in shallow beds | - |
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| secundigravida | (noun) a woman who is pregnant for the second time | Synonyms: gravida II |
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| segregate | (noun) someone who is or has been segregated | - |
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| segregation | (noun) the act of segregating or sequestering | Synonyms: sequestration |
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| (noun) a social system that provides separate facilities for minority groups | Synonyms: separatism |
| (noun) (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes | - |
| segregationism | (noun) a political orientation favoring political or racial segregation | - |
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| segregationist | (noun) someone who believes the racial groups should be kept apart | Synonyms: segregator |
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| segregator | (noun) someone who believes the racial groups should be kept apart | Synonyms: segregationist |
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| seismogram | (noun) the graphical record of an earth tremor made by using a seismograph | - |
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| seismograph | (noun) a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake) | - |
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| seismography | (noun) the measurement of tremors and shocks and undulatory movements of earthquakes | - |
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| serigraph | (noun) a print made using a stencil process in which an image or design is superimposed on a very fine mesh screen and printing ink is squeegeed onto the printing surface through the area of the screen that is not covered by the stencil | Synonyms: silk screen print, silkscreen |
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| serigraphy | (noun) the act of making a print by the silkscreen method | - |
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| sgraffito | (noun) a ceramic or mural decoration made by scratching off a surface layer to reveal the ground | - |
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| shadowgraph | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiogram, radiograph, skiagram, skiagraph |
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| shortgrass | (noun) any of various grasses that are short and can tolerate drought conditions; common on the dry upland plains just east of the Rocky Mountains | Synonyms: short-grass |
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| silkgrass | (noun) valuable forage grass of dry upland areas and plains of western North America to northern Mexico | Synonyms: Indian millet, mountain rice, Oryzopsis hymenoides, silk grass |
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| skiagram | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiogram, radiograph, shadowgraph, skiagraph |
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| skiagraph | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiogram, radiograph, shadowgraph, skiagram |
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| skiagraphy | (noun) the process of making a radiograph; producing an image on a radiosensitive surface by radiation other than visible light | Synonyms: radiography |
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| sonogram | (noun) an image of a structure that is produced by ultrasonography (reflections of high-frequency sound waves); used to observe fetal growth or to study bodily organs | Synonyms: echogram |
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| sonograph | (noun) an instrument that uses the differential transmission and reflection of ultrasonic waves in order to provide an image of a bodily organ | - |
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| sonography | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: echography, ultrasonography, ultrasound |
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| spectrogram | (noun) a photographic record of a spectrum | Synonyms: spectrograph |
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| spectrograph | (noun) a spectroscope by which spectra can be photographed | - |
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| (noun) a photographic record of a spectrum | Synonyms: spectrogram |
| spirogram | (noun) a recording of breathing made with a spirograph | - |
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| spirograph | (noun) a measuring instrument for recording the depth and rapidity of breathing movements | - |
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| steganography | (noun) act of writing in code or cipher | Synonyms: coding, cryptography, secret writing |
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| stenograph | (noun) a machine for typewriting shorthand characters | - |
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| (noun) a shorthand character | - |
| stenographer | (noun) someone skilled in the transcription of speech (especially dictation) | Synonyms: amanuensis, shorthand typist |
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| stenography | (noun) the act or art of writing in shorthand | - |
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| (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: shorthand, tachygraphy |
| stereophotography | (noun) photography producing images that appear to have depth and solidness and that are created by using a special device (called a stereoscope) to look at two slightly different photographs of something at the same time. | Synonyms: stereo photography, stereoscopic photography |
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| stingray | (noun) large venomous ray with large barbed spines near the base of a thin whiplike tail capable of inflicting severe wounds | - |
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| stratigraphy | (noun) the branch of geology that studies the arrangement and succession of strata | - |
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| strongroom | (noun) a burglarproof and fireproof room in which valuables are kept | - |
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| subgroup | (noun) (mathematics) a subset (that is not empty) of a mathematical group | - |
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| (noun) a distinct and often subordinate group within a group | - |
| subprogram | (noun) a set sequence of steps, part of larger computer program | Synonyms: function, procedure, routine, subroutine |
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| supergrass | (noun) a police informer who implicates many people | Synonyms: grass |
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| tachogram | (noun) a graphical record of speed and distance produced by a tachograph | - |
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| tachograph | (noun) a tachometer that produces a graphical record of its readings; used to record the speed and duration of trips in a motor vehicle | - |
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| tachygraphy | (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: shorthand, stenography |
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| tallgrass | (noun) any of various grasses that are tall and that flourish with abundant moisture | Synonyms: tall-grass |
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| tangram | (noun) a Chinese puzzle consisting of a square divided into seven pieces that must be arranged to match particular designs | - |
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| tardigrade | (noun) an arthropod of the division Tardigrada | - |
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| telegram | (noun) a message transmitted by telegraph | Synonyms: wire |
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| telegraph | (noun) apparatus used to communicate at a distance over a wire (usually in Morse code) | Synonyms: telegraphy |
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| telegrapher | (noun) someone who transmits messages by telegraph | Synonyms: telegraph operator, telegraphist |
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| telegraphese | (noun) language characterized by terseness and ellipsis as in telegrams | - |
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| telegraphist | (noun) someone who transmits messages by telegraph | Synonyms: telegraph operator, telegrapher |
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| telegraphy | (noun) apparatus used to communicate at a distance over a wire (usually in Morse code) | Synonyms: telegraph |
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| (noun) communicating at a distance by electric transmission over wire | - |
| telephotograph | (noun) a photograph made with a telephoto lens | Synonyms: telephoto |
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| (noun) a photograph transmitted and reproduced over a distance | - |
| telephotography | (noun) photography using a telephoto lens | - |
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| (noun) transmission and reproduction of photographs and charts and pictures over a distance | - |
| tendergreen | (noun) Asiatic plant cultivated for its swollen root crown and edible foliage | Synonyms: Brassica perviridis, Brassica rapa perviridis, spinach mustard |
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| tertigravida | (noun) a woman who is pregnant for the third time | Synonyms: gravida III |
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| tetragram | (noun) a word that is written with four letters in an alphabetic writing system | - |
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| thermogram | (noun) a graphical record produced by a thermograph | - |
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| thermograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermometrograph |
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| (noun) medical instrument that uses an infrared camera to reveal temperature variations on the surface of the body | - |
| thermography | (noun) diagnostic technique using a thermograph to record the heat produced by different parts of the body; used to study blood flow and to detect tumors | - |
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| thermogravimeter | (noun) a hydrometer that includes a thermometer | Synonyms: thermohydrometer |
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| thermogravimetry | (noun) the measurement of changes in weight as a function of changes in temperature used as a technique of chemically analyzing substances | - |
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| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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| tigress | (noun) a female tiger | - |
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| tomogram | (noun) A tomogram is an X-ray image produced by tomography. | - |
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| tomograph | (noun) X-ray machine in which a computer builds a detailed image of a particular plane through an object from multiple X-ray measurements | - |
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| tomography | (noun) (medicine) obtaining pictures of the interior of the body | Synonyms: imaging |
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| tonograph | (noun) A recording tonometer, used in medicine. | - |
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| topography | (noun) the configuration of a surface and the relations among its man-made and natural features | - |
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| (noun) precise detailed study of the surface features of a region | - |
| transgression | (noun) the act of transgressing; the violation of a law or a duty or moral principle | Synonyms: evildoing |
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| (noun) the action of going beyond or overstepping some boundary or limit | - |
| (noun) the spreading of the sea over land as evidenced by the deposition of marine strata over terrestrial strata | - |
| transgressor | (noun) someone who transgresses; someone who violates a law or command | - |
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| transmigrante | (noun) a Latin American who buys used goods in the United States and takes them to Latin America to sell | - |
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| transmigration | (noun) the passing of a soul into another body after death | - |
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| transmogrification | (noun) the act of changing into a different form or appearance (especially a fantastic or grotesque one) | - |
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| trigram | (noun) a word that is written with three letters in an alphabetic writing system | - |
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| tugrik | (noun) the basic unit of money in Mongolia | Synonyms: tughrik |
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| tweegram | (noun) an Instagram post that is all words | - |
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| typographer | (noun) one who sets written material into type | Synonyms: compositor, setter, typesetter |
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| typography | (noun) the craft of composing type and printing from it | - |
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| (noun) art and technique of printing with movable type | Synonyms: composition |
| ultrasonography | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: echography, sonography, ultrasound |
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| undergrad | (noun) a university student who has not yet received a first degree | Synonyms: undergraduate |
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| undergraduate | (noun) a university student who has not yet received a first degree | Synonyms: undergrad |
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| underground | (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: metro, subway, subway system, tube |
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| (noun) a secret group organized to overthrow a government or occupation force | Synonyms: resistance |
| undergrowth | (noun) the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest | Synonyms: underbrush, underwood |
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| ungracefulness | (noun) an unpleasant lack of grace in carriage or form or movement or expression | Synonyms: gracelessness |
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