(zoology) One of the Radiata.

Anything which radiates or emits rays. / (automotive) A device that lowers engine coolant temperature by conducting heat to the air, through metal fins.

In a radiate manner; with radiation or divergence from a centre.

The quality of being radiate.

(physics) The electromagnetic radiation emitted from a body as a consequence of its temperature; increasing the temperature of the body increases the amount of radiation produced, and shifts it to shorter wavelengths (higher frequencies) in a manner explained only by quantum mechanics.

(physics) The radiation of beta particles as a result of radioactive decay.

(engineering) Electromagnetic waves with frequencies around one terahertz. / (engineering) Especially electromagnetic waves in the range 0.1-30 THz (or subranges there of, see T-rays or T-waves).

ionizing radiation that is naturally present in the environment.

(medicine, pathology) Any illness produced by ionizing radiation with symptoms ranging from nausea to death.

Synonym of radiation sickness