irradiate \ir*ra"di*ate\, v. i.
   To emit rays; to shine.
   
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irradiate \ir*ra"di*ate\ ([i^]r*r[=a]"d[i^]*[asl]t), a. [L.
   irradiatus, p. p.]
   Illuminated; irradiated. --Mason.
   
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Irradiate \Ir*ra"di*ate\ ([i^]r*r[=a]"d[i^]*[=a]t), v. t. [imp.
   & p. p. {Irradiated} ([i^]r*r[=a]"d[i^]*[=a]`t[e^]d); p. pr.
   & vb. n. {Irradiating} ([i^]r*r[=a]"d[i^]*[=a]`t[i^]ng).] [L.
   irradiatus, p. p. of irradiate. See {In-} in, and {Radiate}.]
   
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   1. To throw rays of light upon; to illuminate; to brighten;
      to adorn with luster.
      
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            Thy smile irradiates yon blue fields. --Sir W.
                                                  Jones.
      
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   2. To enlighten intellectually; to illuminate; as, to
      irradiate the mind. --Bp. Bull.
      
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   3. To animate by heat or light. --Sir M. Hale.
      
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   4. To radiate, shed, or diffuse.
      
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            A splendid fa[,c]ade, . . . irradiating hospitality.
                                                  --H. James.
      
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   5. To expose to radiation of any kind, especially {ionizing  radiation}; as, to sterilize food by irradiating it with
      gamma rays; one can cause mutations in bacteria by
      irradiating them with ultraviolet light.
      [PJC]