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cosmic ray

/ˌkɑzmɪk reɪ/
IPA guide

Other forms: cosmic rays

Definitions of cosmic ray
  1. noun
    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
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    type of:
    ionizing radiation
    high-energy radiation capable of producing ionization in substances through which it passes
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