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irradiation

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irradiation


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Irradiation  \Ir*ra`di*a"tion\,  n.  [Cf.  F.  irradiation.] 
  1.  Act  of  irradiating,  or  state  of  being  irradiated. 
 
  2.  Illumination;  irradiance;  brilliancy.  --Sir  W.  Scott. 
 
  3.  Fig.:  Mental  light  or  illumination.  --Sir  M.  Hale. 
 
  4.  (Opt.)  The  apparent  enlargement  of  a  bright  object  seen 
  upon  a  dark  ground,  due  to  the  fact  that  the  portions  of 
  the  retina  around  the  image  are  stimulated  by  the  intense 
  light;  as  when  a  dark  spot  on  a  white  ground  appears 
  smaller,  or  a  white  spot  on  a  dark  ground  larger,  than  it 
  really  is  esp.  when  a  little  out  of  focus. 
 
  From  WordNet  r  1.6  [wn]: 
 
  irradiation 
  n  :  the  treatment  of  disease  (especially  cancer)  by  exposure  to 
  radiation  [syn:  {radiotherapy},  {radiation  therapy},  {actinotherapy}] 




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