a device that measures the intensity of radiation from, and thus the temperature of, a hot body

(biology) The diversification of species into separate forms that each adapt to occupy a specific environmental niche.

(astronomy) All the electromagnetic radiation and subatomic particles radiated from the Sun, especially that part that reaches the Earth

(astronomy, physics) A region of high-energy charged particles which partly surrounds a planet or star, trapped by its magnetic field and characterized by intense radiation.

plural of radiation fog

(physics) electromagnetic radiation that has a frequency of about 3 to 30 GHz

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

plural of gamma radiation

plural of radiation belt

plural of radiation pyrometer