释义 |
ir·radiation \(ˌ)i, ə+\ noun (-s) Etymology: Middle French, from Late Latin irradiation-, irradiatio, from Latin irradiatus + -ion-, -io -ion 1. a. archaic : a giving off of rays of light b. : the emission of radiant energy (as heat) c. : an emanation, diffusion, or radiation of something from a common center or point of origin or a result of such activity: as (1) : the radiation of a physiologically active agent from a point of origin within the body; especially : the spread of a nervous impulse beyond the usual conduction path (2) obsolete : emission of a supposed influence or immaterial fluid from the eyes (3) : apparent enlargement of a light or bright object or surface when displayed against a dark background; especially : the spreading of light by the grains of a photographic emulsion causing the developed image to be larger and more diffuse at the edges than the optical image — called also diffusion 2. a. archaic : a ray of light b. : mental or spiritual illumination 3. a. : exposure to rays (as ultraviolet light, X rays, or alpha rays) b. : application of X rays, radium rays, or other radiation (as for therapeutic purposes) 4. : irradiance 3 |