- to shed rays of light upon; illuminate.
- to illumine intellectually or spiritually.
- to brighten as if with light.
- to radiate (light, illumination, etc.).
- to heat with radiant energy.
- to treat by exposure to radiation, as of ultraviolet light.
- to expose to radiation.
- to emit rays; shine.
- to become radiant.
- irradiated; bright.
Origin of irradiate
- (tr) physics to subject to or treat with light or other electromagnetic radiation or with beams of particles
- (tr) to expose (food) to electromagnetic radiation to kill bacteria and retard deterioration
- (tr) to make clear or bright intellectually or spiritually; illumine
- a less common word for radiate (def. 1)
- (intr) obsolete to become radiant
c.1600, "to cast beams of light upon," from Latin irradiatus, past participle of irradiare "shine forth," from assimilated form of in- "into, in" (see in- (2)) + radiare "to shine" (see radiate). Meaning "expose to radiation other than light" (originally X-rays) is from 1901. Related: Irradiated; irradiating.
- To expose to radiation, as for diagnostic or therapeutic purposes.
- To treat with radiation.
- To apply radiation to a structure or organism.
- To expose to or treat with radiation. For example, meat sold as food is often irradiated with x-rays or other radiation to kill bacteria; uranium 238 can be irradiated with neutrons to create fissionable plutonium 239.