<HEAD><TITLE>DICTIONARY: radio - radio emission</TITLE></HEAD>
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<A NAME="radio">
<B>radio, </B>noun, pl. <B>-dios,</B> adjective, verb, <B>-dioed,</B> <B>-dioing.</B><DL COMPACT><DD><I>noun </I> <B>1. </B>the way of sending and receiving words, music, and other sounds by electric waves, without wires. <BR> <I>Ex. We can listen to music broadcast by radio.</I> <DD><B> 2. </B>a device for receiving and making it possible to hear sounds so sent; receiver. <BR> <I>Ex. His radio cost $30.</I> <DD><B> 3. </B>(Informal.) a message sent by radio. <DD><B> 4. </B>the business of broadcasting by radio. <BR> <I>Ex. He left acting and got a job in radio.</I> <DD><B> 5. </B>the branch of physics dealing with electromagnetic waves as used in communication. <DD><I>adj. </I> <B>1. </B>of or having to do with radio. <BR> <I>Ex. Seventeen minutes after launching, its first radio signals beeped to the trackingstation (Time).</I> <DD><B> 2. </B>used in radio. <BR> <I>Ex. a radio transmitter.</I> <DD><B> 3. </B>sent by radio. <BR> <I>Ex. a radio program.</I> <DD><B> 4. </B>of or having to do with electric frequencies higher than 15,000 cycles per second. <DD><I>v.t. </I> <B>1. </B>to transmit or send out by radio. <BR> <I>Ex. The ship radioed a call for help. Word that the proclamation had been signed was radioed ahead from the speeding Presidential limousine (New York Times).</I> <DD><B> 2. </B>to communicate with by radio. <DD><I>v.i. </I> to transmit or send out a message, news, music, and other sounds, by radio. </DL>
<A NAME="radio">
<B>radio-,</B><DL COMPACT><DD> (combining form.) <DD><B> 1. </B>radio. <BR> <I>Ex. Radiobroadcast = a broadcast by radio.</I> <DD><B> 2. </B>radial; radially. <BR> <I>Ex. Radiosymmetrical = radially symmetrical.</I> <DD><B> 3. </B>radiant energy. <BR> <I>Ex. Radiometer = an instrument that measures radiant energy.</I> <DD><B> 4. </B>radioactive. <BR> <I>Ex. Radioisotope = a radioactive isotope.</I> </DL>
<A NAME="radioactivate">
<B>radioactivate, </B>transitive verb, <B>-vated,</B> <B>-vating.</B><DL COMPACT><DD> to make radioactive. </DL>
<A NAME="radioactive">
<B>radioactive, </B>adjective.<DL COMPACT><DD><B> 1. </B>giving off radiant energy in the form of alpha, beta, or gamma rays by the breaking up of atoms. Radium, uranium, and thorium are radioactive metallic elements. <BR> <I>Ex. It takes some time for air currents to distribute radioactive dust across the world (New Scientist).</I> <DD><B> 2. </B>of, having, or caused by radioactivity. <BR> <I>Ex. Further disposal studies showed that the 55-gallon oil drum containers, used to package radioactive wastes were very rugged (Science News Letter).</I> adv. <B>radioactively.</B> </DL>
<A NAME="radioactivedecay">
<B>radioactive decay,</B><DL COMPACT><DD> the spontaneous disintegration of a radioactive substance, at the characteristic rate of the particular radioisotope, and accompanied by the emission of nuclear radiation. <BR> <I>Ex. The spontaneous change taking place in an unstable atomic nucleus is known as radioactive decay (The Effects of Atomic Weapons).</I> </DL>
<A NAME="radioactiveseries">
<B>radioactive series,</B><DL COMPACT><DD> one of several series of isotopes of certain elements representing various stages of disintegration of a radioactive substance. Three of these series occur naturally (the actinium, thorium, and uranium series) and others, such as the neptunium series, are artificially produced. </DL>
<A NAME="radioactivity">
<B>radioactivity, </B>noun.<DL COMPACT><DD><B> 1. </B>the property (exhibited by certain elements) of giving off radiant energy in the form of alpha particles, beta particles, or gamma rays, as the result of spontaneous disintegration of the nuclei of atoms. <BR> <I>Ex. We'll have to learn to control radioactivity just as we learned to control fire (Bulletin of Atomic Scientists).</I> <DD><B> 2. </B>the radiation given off. <BR> <I>Ex. How much liability insurance should a plant have against the not inconceivable possibility that it overheat and spew its radioactivity around the neighborhood? (Newsweek).</I> </DL>
<A NAME="radioaltimeter">
<B>radio altimeter,</B><DL COMPACT><DD> an altimeter which uses radio signals to measure height from the ground at low altitudes. </DL>
<A NAME="radioastronomer">
<B>radio astronomer,</B><DL COMPACT><DD> an expert in radio astronomy. </DL>
<A NAME="radioastronomical">
<B>radio-astronomical, </B>adjective.<DL COMPACT><DD> of or having to do with radio astronomy. <BR> <I>Ex. radio-astronomical observations.</I> </DL>
<A NAME="radioastronomy">
<B>radio astronomy,</B><DL COMPACT><DD> the branch of astronomy dealing with the detection of objects in space by means of radio waves that these objects give off. Radio astronomy enables observers to study heavenly bodies beyond the range of ordinary telescopes. </DL>
<A NAME="radioautograph">
<B>radioautograph, </B>noun.<DL COMPACT><DD> a picture of an object produced on a sensitized surface, such as photographic film, by rays from some radioactive substance; autoradiograph. <BR> <I>Ex. Radioautographs showed that the new growing leaves drew on mature leaves for [phosphorus] until the old leaves were depleted and died (Some Applications of Atomic Energy in Plant Science).</I> </DL>
<A NAME="radioautographic">
<B>radioautographic, </B>adjective.<DL COMPACT><DD> of a radioautograph or radioautography; autoradiographic. </DL>
<A NAME="radioautography">
<B>radioautography, </B>noun.<DL COMPACT><DD> the process of producing radioautographs; autoradiography. </DL>
<A NAME="radiobeacon">
<B>radio beacon,</B><DL COMPACT><DD> a radio station for sending special signals so that ships and airplanes can determine their position. </DL>
<A NAME="radiobeam">
<B>radio beam,</B><DL COMPACT><DD> a continuous signal by radio to show the proper course for an airplane, especially one giving the course to a certain airport. </DL>
<A NAME="radiobiological">
<B>radiobiological, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or having to do with radiobiology. <BR> <I>Ex. radiobiological phenomena or studies.</I> <DD><B> 2. </B>caused by radiation. <BR> <I>Ex. Removal of oxygen before irradiation was found to protect cells against many kinds of radiobiological damage (Science News Letter).</I> </DL>
<A NAME="radiobiologist">
<B>radiobiologist, </B>noun.<DL COMPACT><DD> an expert in radiobiology. </DL>
<A NAME="radiobiology">
<B>radiobiology, </B>noun.<DL COMPACT><DD> the branch of biology dealing with the effects of radiation on animal bodies. </DL>
<A NAME="radiobroadcast">
<B>radiobroadcast, </B>noun, verb, <B>-cast</B> or <B>-casted,</B> <B>-casting.</B><DL COMPACT><DD><I>noun </I> <B>1. </B>the action of broadcasting by radio. <DD><B> 2. </B>such a broadcast. <DD><I>v.t., v.i. </I> to broadcast by radio. noun <B>radiobroadcaster.</B> </DL>
<A NAME="radiocar">
<B>radio car,</B><DL COMPACT><DD> an automobile, such as a squad car, equipped with a two-way radio. <BR> <I>Ex. Several radio cars responded (New York Times).</I> </DL>
<A NAME="radiocarbon">
<B>radiocarbon, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> having to do with a method of determining the age of a substance, such as a fossil, by measuring its radioactive carbon content. <BR> <I>Ex. With the temperature cycles thus established, the next step was to date them by radiocarbon analysis (Scientific American).</I> <DD><I>noun </I> a radioactive isotope of carbon, especially carbon 14. </DL>
<B>radiocast, </B>verb, <B>-cast</B> or <B>-casted,</B> <B>-casting,</B> noun.<DL COMPACT><DD><I>v.t., v.i. </I> to broadcast by radio. <DD><I>noun </I> a broadcast by radio; radiobroadcast. <BR> <I>Ex. In the rich voice with which he dominated the radiocast of the coronation, the archbishop was ranging through the state of Christianity around the world (Time).</I> noun <B>radiocaster.</B> </DL>
<A NAME="radiocesium">
<B>radiocesium</B> or <B>radiocaesium, </B>noun.<DL COMPACT><DD> a radioisotope of cesium, used in radiotherapy. </DL>
<A NAME="radiochemical">
<B>radiochemical, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> of or having to do with radiochemistry. <DD><I>noun </I> a chemical to which radioactive isotopes have been added. <BR> <I>Ex. It is offering a full range of radiochemicals with the addition of radioisotopes to its line of laboratory reagents (New York Times).</I> </DL>
<A NAME="radiochemist">
<B>radiochemist, </B>noun.<DL COMPACT><DD> an expert in radiochemistry. </DL>
<A NAME="radiochemistry">
<B>radiochemistry, </B>noun.<DL COMPACT><DD> the branch of chemistry dealing with radioactive substances. </DL>
<A NAME="radiocobalt">
<B>radiocobalt, </B>noun.<DL COMPACT><DD> a radioactive isotope of cobalt, used in radiology and radiotherapy. <BR> <I>Ex. A piece of radiocobalt, as big as a pea, can replace an X-ray set weighing several hundred pounds (Atlantic).</I> </DL>
<A NAME="radiocompass">
<B>radiocompass, </B>noun.<DL COMPACT><DD> a device for finding the direction from which radio messages are received, used to determine position, as of an aircraft or a ship at sea; radio direction finder. </DL>
<A NAME="radioconductor">
<B>radioconductor, </B>noun.<DL COMPACT><DD> a device that detects electric waves, such as a coherer in wireless telegraphy. </DL>
<A NAME="radiodiagnosis">
<B>radiodiagnosis, </B>noun.<DL COMPACT><DD> medical diagnosis by means of X rays, radiographs, or the like. </DL>
<A NAME="radiodirectionfinder">
<B>radio direction finder,</B> <B>=radiocompass.</B></DL>
<A NAME="radioecological">
<B>radioecological, </B>adjective.<DL COMPACT><DD> of or having to do with radioecology. </DL>
<A NAME="radioecologist">
<B>radioecologist, </B>noun.<DL COMPACT><DD> a specialist in radioecology. <BR> <I>Ex. Radioecologists collect insects and leaf samples in a forest inoculated with radioactive cesium 137 (Ralph E. Lapp).</I> </DL>
<A NAME="radioecology">
<B>radioecology, </B>noun.<DL COMPACT><DD> the study of radioactivity in the environment and its effect upon plants and animals, especially in a particular locality. </DL>
<A NAME="radioelement">
<B>radioelement, </B>noun.<DL COMPACT><DD> a radioactive element, especially one produced artificially. <BR> <I>Ex. Weathering effects beyond two years will depend very critically upon the nature of the radioelements which then predominate in the fallout debris (Bulletin of Atomic Scientists).</I> </DL>
<A NAME="radioemission">
<B>radio emission,</B><DL COMPACT><DD> the emission of radio waves by objects in space. <BR> <I>Ex. Giant antennae forming radio telescopes allow the observation of radio emissions of heavenly bodies (Science News Letter).</I> </DL>
