n. [ L. radiatio: cf. F. radiation. ] 1. The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness. [ 1913 Webster ]
2. The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat. [ 1913 Webster ]
(n) graphical representation (in polar or Cartesian coordinates) of the spatial distribution of radiation from an antenna as a function of angle, Syn.radiation diagram, pattern
(n) a pyrometer for estimating the temperature of distant sources of heat; radiation is focussed on a thermojunction connected in circuit with a galvanometer
(n) 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, Syn.radiation, radiation syndrome, Example: he was suffering from radiation
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