Webster's English Dictionary

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irradiate

ir.ra.di.ate \ir-'a-d-e--.a-t\ \-.a-t-iv\ vb [L irradiatus, pp. of 
   irradiare, fr. in- + radius ray] 1a: to cast rays of light upon : 
   ILLUMINATE  1b: to enlighten intellectually or spiritually  1c: to affect 
   or treat by radiant energy (as heat); specif : to tr eat by exposure to 
   radiation 2: to emit like rays of light : RADIATE  archaic  : to emit rays 
   : SHINE  - ir.ra.di.a.tive aj