Borrowed from Latin radiatus, past participle of radiare ("to radiate, furnish with spokes, give out rays, radiate, shine"), from radius ("a spoke, ray").

• (verb) IPA: /ˈɹeɪdieɪt/
• (adjective) IPA: /ˈɹeɪdieɪt/, /ˈɹeɪdi.ət/

radiate (radiates, present participle radiating; simple past and past participle radiated)

1. To extend, send or spread out from a center like radii.
   • 1994, Great Britain. Parliament. House of Commons, Parliamentary Debates:

     Oban is not a terminus; its routes radiate by sea, rail and road.

2. (transitive) To emit rays or waves.

   The stove radiates heat.

3. (intransitive) To come out or proceed in rays or waves.

   The heat radiates from a stove.

   • 1706, John Locke, Elements of Natural Philosophy:

     Light radiates from luminous bodies directly to our eyes.

4. (transitive) To illuminate.
5. To expose to ionizing radiation, such as by radiography.
6. (transitive) To manifest oneself in a glowing manner.
7. (ecology, intransitive) To spread into new habitats, migrate.

• (to expose to radiation) irradiate

• radiation
• radiative

• Italian: irradiare

• Spanish: irradiar

radiate

1. Radiating from a center; having rays or parts diverging from a center; radiated.

   a radiate crystal

2. Surrounded by rays, such as the head of a saint in a religious picture; (heraldry) radiant.
3. (botany) Having parts radiating from the center, like the petals in many flowers.
4. (botany) Consisting of a disc in which the florets are tubular.
5. (biology) Having radial symmetry, like a seastar.
6. (zoology) Belonging to the Radiata.

radiate (plural radiates)

1. (zoology) One of the Radiata.

• radial
• radiation
• radio
• radius
• ray