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say it: ray-dee-AY-shuhn
radiation is a noun meaning "energy that is radiated or transmitted in the form of rays or waves or particles". It is pronounced /ˌɹeɪdiˈeɪʃən/ — ray-dee-AY-shuhn. It carries 7 recorded senses.
energy that is radiated or transmitted in the form of rays or waves or particles
the act of spreading outward from a central source
syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours
“he was suffering from radiation”
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
the spread of a group of organisms into new habitats
a radial arrangement of nerve fibers connecting different parts of the brain
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
medicine
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for radiation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.