Glossary · Nouns · R
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TermTypeDefinitionClassificationsUpdated
Radiancenounthe amount of electromagnetic radiation leaving or arriving at a point on a surfaceverified
Radiant HeatingnounMWEheating a building by radiation from panels containing hot water or electrical heatersverified
Radiationnounsyndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions)verified
Radiation DiagramnounMWEgraphical representation (in polar or Cartesian coordinates) of the spatial distribution of radiation from an antenna as a function of angleverified
Radiation MonitoringnounMWERadiation monitoring is the process of receiving images, data, or audio from an unprotected source by listening to radiation signals.ProcessRegulated
Radiation PatternnounMWEgraphical representation (in polar or Cartesian coordinates) of the spatial distribution of radiation from an antenna as a function of angleverified
Radiation PressurenounMWEthe minute pressure exerted on a surface normal to the direction of propagation of a waveverified
Radiation PyrometernounMWEa pyrometer for estimating the temperature of distant sources of heatverified
Radiation SicknessnounMWEsyndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions)verified
Radiation SyndromenounMWEsyndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions)verified
Radiation TherapynounMWE(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substanceverified
Radiatornounheater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildingsverified
Radiator CapnounMWEcap on the opening in the top of a radiator through which a coolant liquid can be addedverified
Radical ChicnounMWEan affectation of radical left-wing views and the fashionable dress and lifestyle that goes with themverified
Radical HysterectomynounMWEsurgical removal of the uterus and the ovaries and oviducts and cervix and related lymph nodesverified
Radical MastectomynounMWEremoval of a breast and the underlying muscles (pectoralis major and pectoralis minor) and lymph nodes in the adjacent armpitverified
Radicalismnounthe political orientation of those who favor revolutionary change in government and societyverified
Radio AerialnounMWEomnidirectional antenna comprising the part of a radio receiver by means of which radio signals are receivedverified
Radio AntennanounMWEomnidirectional antenna comprising the part of a radio receiver by means of which radio signals are receivedverified
Radio AstronomynounMWEthe branch of astronomy that detects and studies the radio waves emitted by celestial bodiesverified
Radio BeaconnounMWEa radio station that broadcasts a directional signal for navigational purposesverified
Radio CompassnounMWEa direction finder that gives a bearing by determining the direction of incoming radio signalsverified
Radio Detection and RangingnounMWEmeasuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objectsverified
Radio Frequency IdentificationnounMWEA form of automatic identification and data capture (AIDC) that uses electric or magnetic fields at radio frequencies to transmit information.Physical
Radio InterferometernounMWEradio telescope that uses interference patterns from two antennas instead of a parabolic antennaverified
Radio ReceivernounMWEan electronic receiver that detects and demodulates and amplifies transmitted signalsverified
Radio ReflectornounMWEastronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sourcesverified
Radio SetnounMWEan electronic receiver that detects and demodulates and amplifies transmitted signalsverified
Radio SpectrumnounMWEthe entire spectrum of electromagnetic frequencies used for communicationsverified
Radio StationnounMWEstation for the production and transmission of AM or FM radio broadcastsverified
Radio TelescopenounMWEastronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sourcesverified
Radio TransmitternounMWEtransmitter that is the part of a radio system that transmits signalsverified
Radio-Controlled AircraftnounMWEan aircraft without a pilot that is operated by remote controlverified
Radio-Frequency SpectrumnounMWEthe entire spectrum of electromagnetic frequencies used for communicationsverified
Radio-Gramophonenounelectronic equipment consisting of a combination of a radio receiver and a record playerverified
Radio-Phonographnounelectronic equipment consisting of a combination of a radio receiver and a record playerverified
Radioactive DatingnounMWEmeasurement of the amount of radioactive material, usually carbon 14, that an object containsverified
Radioactive DecaynounMWEthe spontaneous disintegration of a radioactive substance along with the emission of ionizing radiationverified
Radioactive DustnounMWEthe radioactive particles that settle to the ground after a nuclear explosionverified
Radioactive Iodine Excretion TestnounMWEradioactive iodine test that measures the amount of radioactive iodine excreted in the urineverified
Radioactive Iodine TestnounMWEtest of thyroid function in which the patient is given an oral dose of radioactive iodine-131verified
Radioactive Iodine Uptake TestnounMWEradioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid glandverified
Radioactive WastenounMWEuseless radioactive materials that are left after some laboratory or commercial process is completedverified
Radioactivitynounthe spontaneous emission of a stream of particles or electromagnetic rays in nuclear decayverified
Radiobiologynounthe branch of biology that studies the effects of radiation on living organismsverified
Radiocarbon DatingnounMWEa chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14verified
Radiocarpal JointnounMWEa joint between the distal end of the radius and the proximal row of carpal bonesverified
Radiogramnouna photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)verified
Radiographnouna photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays)verified
Radiolocationnounmeasuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objectsverified