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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