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From Biology-Online Dictionary
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1. To throw rays of light upon; to illuminate; to brighten; to adorn with luster. Thy smile irradiates yon blue fields. (Sir W. Jones)

2. To enlighten intellectually; to illuminate; as, to irradiate the mind.

3. To animate by heat or light.

4. To radiate, shed, or diffuse. A splendid faade, . . . Irradiating hospitality. (H. James)

Origin: L. Irradiatus, p. P. Of irradiate. See in- in, and radiate.

to emit rays; to shine.

Illuminated; irradiated.

Origin: L. Irradiatus, p. P.