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radiation (C1)

noun

Pronunciation: /ˌreɪ.diˈeɪ.ʃən/

The emission or transmission of energy in the form of waves or particles through space or through a medium.

The Chernobyl disaster released dangerous levels of radiation into the atmosphere.
Doctors use radiation therapy to treat certain types of cancer.
Exposure to ultraviolet radiation from the sun can cause sunburn.

radiation therapy (collocation): A medical treatment that uses radiation to kill cancer cells. — "She is undergoing radiation therapy for her breast cancer."
ionizing radiation (collocation): Radiation with enough energy to remove an electron from an atom or molecule. — "Nuclear power plants must carefully manage ionizing radiation."
electromagnetic radiation (collocation): Radiation made up of oscillating electric and magnetic fields. — "Visible light is a form of electromagnetic radiation."