资料来源 : pyDict

放射,发射;放射物;散热器;射线疗法

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Radiation \Ra`di*a"tion\, 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.

   2. The shooting forth of anything from a point or surface,
      like the diverging rays of light; as, the radiation of
      heat.

资料来源 : WordNet®

radiation
     n 1: energy that is radiated or transmitted in the form of rays
          or waves or particles
     2: the act of spreading outward from a central source
     3: 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" [syn: {radiation
        sickness}, {radiation syndrome}]
     4: the spontaneous emission of a stream of particles or
        electromagnetic rays in nuclear decay [syn: {radioactivity}]
     5: the spread of a group of organisms into new habitats
     6: a radial arrangement of nerve fibers connecting different
        parts of the brain
     7: (medicine) the treatment of disease (especially cancer) by
        exposure to radiation from a radioactive substance [syn: {radiotherapy},
         {radiation therapy}, {actinotherapy}, {irradiation}]