## Etymology
From Latin irradiatus, past participle of irradiare 'to shine upon', from in- 'into, upon' plus radiare 'to emit rays', from radius 'ray, beam'.

## AI Etymology
irradiate comes from Latin irradiatus, past participle of irradiare 'to shine upon', from in- 'into, upon' plus radiare 'to emit rays', from radius 'ray, beam'. Morphologically, the prefixed shape matters: the initial element belongs to the recorded formation and helps explain the modern form's surface analysis. In present English, the verb sense is "to expose to or shine with radiant light or radiation", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as radiate, radiant, and radiation, and in derivatives such as irradiation, irradiator, and irradiant. Its semantic neighborhood includes illuminate, light, brighten, and radiate, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin irradiare and Latin radius.

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