radian
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～ 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)
radiance
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～ the quality of being bright and sending out rays of light
radiance
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～ an attractive combination of good health and happiness; "the radiance of her countenance"
radiance
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～ the amount of electromagnetic radiation leaving or arriving at a point on a surface
radiancy
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～ the quality of being bright and sending out rays of light
radiant flux
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～ the rate of flow of radiant energy (electromagnetic waves)
radiant heating
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～ heating a building by radiation from panels containing hot water or electrical heaters
radiant energy
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～ energy that is transmitted in the form of (electromagnetic) radiation; energy that exists in the absence of matter
radiatio optica
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～ a nerve pathway from the lateral geniculate body to the visual cortex
radiation
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～ the act of spreading outward from a central source
radiation pyrometer
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～ a pyrometer for estimating the temperature of distant sources of heat; radiation is focussed on a thermojunction connected in circuit with a galvanometer
radiation
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～ 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; "he was suffering from radiation"
radiation
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～ the spread of a group of organisms into new habitats
radiation
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～ the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
radiation diagram
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～ graphical representation (in polar or Cartesian coordinates) of the spatial distribution of radiation from an antenna as a function of angle
radiation
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～ (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
radiation
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～ energy that is radiated or transmitted in the form of rays or waves or particles
radiation field
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～ a field that represents the energy lost from the radiator to space
radiation
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～ a radial arrangement of nerve fibers connecting different parts of the brain