- radiate (v.)
- 1610s, "spread in all directions from a point," from Latin radiatus, past participle of radiare "to beam, shine, gleam; make beaming" (see radiation). Meaning "be radiant, give off rays (of light or heat)" is from 1704. Related: Radiated; radiates; radiating.
- radiate (adj.)
- "having rays, furnished with rays, shining," 1660s, from Latin radiatus (see radiate (v.)).