v. To throw rays of light upon; to illuminate; to brighten; to adorn with luster.v. To enlighten intellectually; to illuminate; as, to irradiate the mind.v. To animate by heat or light.v. To radiate, shed, or diffuse.v. To emit rays; to shine.v. To treat (food) with ionizing radiation in order to destroy bacteriaadj. Illuminated; irradiated; made brilliant or splendid.