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Cosmic ray   /kˈɑzmɪk reɪ/   Listen
Cosmic ray

noun
1.
Highly penetrating ionizing radiation of extraterrestrial origin; consisting chiefly of protons and alpha particles; collision with atmospheric particles results in rays and particles of many kinds.






WordNet 3.0 © 2010 Princeton University








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Words linked to "Cosmic ray" :   cosmic radiation, ionizing radiation



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