cosmic ray - WordReference.com Dictionary of English

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  - cosh
  - COSHH
  - cosine
  - cosmetic
  - cosmetician
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  - cosmic dust
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  - cosmic ray
  - cosmic string
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cosmic ray

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Concise Oxford English Dictionary © 2008 Oxford University Press:
cosmic ray

▶noun a highly energetic atomic nucleus or other particle travelling through space at a speed approaching that of light.

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