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Definition of cosmic rays noun from the Oxford Advanced Learner's Dictionary

cosmic rays

noun
 
/ˌkɒzmɪk ˈreɪz/
 
/ˌkɑːzmɪk ˈreɪz/
 [plural]
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  1. rays that reach the earth from outer spaceTopics Spacec2
See cosmic rays in the Oxford Advanced American Dictionary
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