Meaning of RADIATION in English

RADIATION

n.1 the act or an instance of radiating; the process of being radiated.

2 Physics a the emission of energy as electromagnetic waves or as moving particles. b the energy transmitted in this way, esp. invisibly.

3 (in full radiation therapy) treatment of cancer and other diseases using radiation, such as X-rays or ultraviolet light.

Phrases and idioms:

radiation chemistry the study of the chemical effects of radiation on matter. radiation sickness sickness caused by exposure to radiation, such as X-rays or gamma rays.

Derivatives:

radiational adj. radiationally adv.

Etymology: L radiatio (as RADIATE)

Oxford English vocab.      Оксфордский английский словарь.