| andradite | (noun) a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone | - |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| coloradillo | (noun) handsome shrub with showy orange to scarlet or crimson flowers; Florida and West Indies to Mexico and Brazil | Synonyms: Hamelia erecta, Hamelia patens, scarlet bush, scarlet hamelia |
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| contradiction | (noun) the speech act of contradicting someone | - |
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| (noun) (logic) a statement that is necessarily false | Synonyms: contradiction in terms |
| (noun) opposition between two conflicting forces or ideas | - |
| contradictoriness | (noun) the relation that exists when opposites cannot coexist | - |
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| contradictory | (noun) two propositions are contradictories if both cannot be true (or both cannot be false) at the same time | - |
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| contradistinction | (noun) a distinction drawn on the basis of contrast | - |
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| eradication | (noun) the complete destruction of every trace of something | Synonyms: obliteration |
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| eradicator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: exterminator, terminator |
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| estradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: oestradiol |
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| extradition | (noun) the surrender of an accused or convicted person by one state or country to another (usually under the provisions of a statute or treaty) | - |
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| fradicin | (noun) an antibiotic obtained from an actinomycete and used (as a sulphate under the trade name Neobiotic) as an intestinal antiseptic in surgery | Synonyms: Neobiotic, neomycin |
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| gradient | (noun) the property possessed by a line or surface that departs from the horizontal | Synonyms: slope |
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| (noun) a graded change in the magnitude of some physical quantity or dimension | - |
| grading | (noun) the act of arranging in a graduated series | Synonyms: scaling |
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| (noun) evaluation of performance by assigning a grade or score | Synonyms: marking, scoring |
| (noun) changing the ground level to a smooth horizontal or gently sloping surface | Synonyms: leveling |
| horseradish | (noun) grated horseradish root | - |
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| (noun) coarse Eurasian plant cultivated for its thick white pungent root | Synonyms: Armoracia rusticana, horse radish, red cole |
| (noun) the root of the horseradish plant; it is grated or ground and used for seasoning | Synonyms: horseradish root |
| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
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| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |
| microradian | (noun) a unit of angular distance equal to one thousandth of a milliradian | - |
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| milliradian | (noun) a unit of angular distance equal to one thousandth of a radian | - |
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| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
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| paradiddle | (noun) the sound of a drum (especially a snare drum) beaten rapidly and continuously | Synonyms: drum roll, roll |
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| paradigm | (noun) a standard or typical example | Synonyms: epitome, image, prototype |
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| (noun) the generally accepted perspective of a particular discipline at a given time | - |
| (noun) the class of all items that can be substituted into the same position (or slot) in a grammatical sentence (are in paradigmatic relation with one another) | Synonyms: substitution class |
| (noun) systematic arrangement of all the inflected forms of a word | - |
| paradise | (noun) any place of complete bliss and delight and peace | Synonyms: Eden, heaven, nirvana, promised land, Shangri-la |
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| radial | (noun) pneumatic tire that has radial-ply casing | Synonyms: radial-ply tire, radial tire |
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| radian | (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: rad |
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| radiance | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiancy, refulgence, refulgency, shine |
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| (noun) the amount of electromagnetic radiation leaving or arriving at a point on a surface | Synonyms: glow, glowing |
| (noun) an attractive combination of good health and happiness | - |
| radiancy | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, refulgence, refulgency, shine |
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| radiation | (noun) the act of spreading outward from a central source | - |
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| (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, irradiation, radiation therapy, radiotherapy |
| (noun) a radial arrangement of nerve fibers connecting different parts of the brain | - |
| (noun) the spread of a group of organisms into new habitats | - |
| (noun) energy that is radiated or transmitted in the form of rays or waves or particles | - |
| (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radioactivity |
| (noun) syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours | Synonyms: radiation sickness, radiation syndrome |
| radiator | (noun) a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan | - |
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| (noun) heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings | - |
| (noun) any object that radiates energy | - |
| radical | (noun) a character conveying the lexical meaning of a logogram | - |
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| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, root, root word, stem, theme |
| (noun) a person who has radical ideas or opinions | - |
| (noun) (mathematics) a quantity expressed as the root of another quantity | - |
| (noun) (chemistry) two or more atoms bound together as a single unit and forming part of a molecule | Synonyms: chemical group, group |
| (noun) an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule | Synonyms: free radical |
| radicalism | (noun) the political orientation of those who favor revolutionary change in government and society | - |
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| radicchio | (noun) prized variety of chicory having globose heads of red leaves | - |
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| radicle | (noun) (anatomy) a small structure resembling a rootlet (such as a fibril of a nerve) | - |
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| radiculitis | (noun) inflammation of the radicle of a nerve | - |
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| radio | (noun) a communication system based on broadcasting electromagnetic waves | Synonyms: wireless |
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| (noun) an electronic receiver that detects and demodulates and amplifies transmitted signals | Synonyms: radio receiver, radio set, receiving set, tuner, wireless |
| (noun) medium for communication | Synonyms: radiocommunication, wireless |
| radioactivity | (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radiation |
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| radiobiologist | (noun) a biologist who studies the effects of radiation on living organisms | - |
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| radiobiology | (noun) the branch of biology that studies the effects of radiation on living organisms | - |
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| radiocarbon | (noun) a radioactive isotope of carbon | Synonyms: carbon 14 |
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| radiochemist | (noun) a chemist who specializes in nuclear chemistry | Synonyms: nuclear chemist |
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| radiochemistry | (noun) the chemistry of radioactive substances | Synonyms: nuclear chemistry |
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| radiochlorine | (noun) a radioactive isotope of chlorine | - |
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| radiocommunication | (noun) medium for communication | Synonyms: radio, wireless |
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| radiogram | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiograph, shadowgraph, skiagram, skiagraph |
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| (noun) a message transmitted by wireless telegraphy | - |
| radiograph | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiogram, shadowgraph, skiagram, skiagraph |
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| radiographer | (noun) a person who makes radiographs | - |
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| radiography | (noun) photography that uses other kinds of radiation than visible light | - |
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| (noun) the process of making a radiograph; producing an image on a radiosensitive surface by radiation other than visible light | Synonyms: skiagraphy |
| radioimmunoassay | (noun) immunoassay of a substance that has been radioactively labeled | - |
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| radioisotope | (noun) a radioactive isotope of an element; produced either naturally or artificially | - |
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| radiolarian | (noun) protozoa with amoeba-like bodies and radiating filamentous pseudopods | - |
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| radiolocation | (noun) measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects | Synonyms: microwave radar, radar, radio detection and ranging |
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| radiologist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiotherapist |
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| radiology | (noun) (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation | Synonyms: radioscopy |
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| (noun) the branch of medical science dealing with the medical use of X-rays or other penetrating radiation | - |
| radiolysis | (noun) molecular disintegration resulting from radiation | - |
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| radiometer | (noun) meter to detect and measure radiant energy (electromagnetic or acoustic) | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| radiopacity | (noun) opacity to X-rays or other radiation | Synonyms: radio-opacity |
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| radiopharmaceutical | (noun) pharmaceutical consisting of a radioactive compound used in radiation therapy | - |
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| radiophone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiotelephone, wireless telephone |
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| radiophoto | (noun) a photograph transmitted by radio waves | Synonyms: radiophotograph |
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| radiophotograph | (noun) a photograph transmitted by radio waves | Synonyms: radiophoto |
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| radiophotography | (noun) transmission of photographs by radio waves | - |
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| radioprotection | (noun) protection against harmful effects of radiation | - |
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| radioscopy | (noun) (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation | Synonyms: radiology |
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| radiosensitivity | (noun) sensitivity to the action of radiant energy | Synonyms: photosensitivity |
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| 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 |
| radiotelephone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiophone, wireless telephone |
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| (noun) telephony that uses transmission by radio rather than by wire | Synonyms: radiotelephony, wireless telephone |
| radiotelephony | (noun) telephony that uses transmission by radio rather than by wire | Synonyms: radiotelephone, wireless telephone |
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| radiotherapist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiologist |
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| radiotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, irradiation, radiation, radiation therapy |
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| radiothorium | (noun) radioactive isotope of thorium with mass number 228 | Synonyms: thorium-228 |
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| radish | (noun) pungent fleshy edible root | - |
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| (noun) Eurasian plant widely cultivated for its edible pungent root usually eaten raw | Synonyms: Raphanus sativus |
| (noun) pungent edible root of any of various cultivated radish plants | - |
| (noun) radish of Japan with a long hard durable root eaten raw or cooked | Synonyms: daikon, Japanese radish, Raphanus sativus longipinnatus |
| (noun) a cruciferous plant of the genus Raphanus having a pungent edible root | Synonyms: radish plant |
| radium | (noun) an intensely radioactive metallic element that occurs in minute amounts in uranium ores | Synonyms: atomic number 88, Ra |
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| radius | (noun) support consisting of a radial member of a wheel joining the hub to the rim | Synonyms: spoke, wheel spoke |
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| (noun) the length of a line segment between the center and circumference of a circle or sphere | Synonyms: r |
| (noun) the outer and slightly shorter of the two bones of the human forearm | - |
| (noun) a circular region whose area is indicated by the length of its radius | - |
| (noun) a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) | - |
| radix | (noun) (numeration system) the positive integer that is equivalent to one in the next higher counting place | Synonyms: base |
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| sporadicalness | (noun) The quality of being rare and scattered in occurrence. | - |
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| steradian | (noun) the unit of solid angle adopted under the Systeme International d'Unites | Synonyms: sr |
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| taradiddle | (noun) a trivial lie | Synonyms: fib, story, tale, tarradiddle |
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| (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, tarradiddle, tommyrot, tosh, twaddle |
| tarradiddle | (noun) a trivial lie | Synonyms: fib, story, tale, taradiddle |
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| (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, taradiddle, tommyrot, tosh, twaddle |
| trading | (noun) buying or selling securities or commodities | - |
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| tradition | (noun) an inherited pattern of thought or action | - |
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| (noun) a specific practice of long standing | Synonyms: custom |
| traditionalism | (noun) adherence to tradition (especially in cultural or religious matters) | - |
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| (noun) strict adherence to traditional methods or teachings | Synonyms: traditionality |
| (noun) the doctrine that all knowledge was originally derived by divine revelation and that it is transmitted by traditions | - |
| traditionalist | (noun) one who adheres to traditional views | Synonyms: diehard |
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| traditionality | (noun) strict adherence to traditional methods or teachings | Synonyms: traditionalism |
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| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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