What is the meaning of cosmic ray?

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. .
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). cosmic ray. Retrieved September 20, 2026, from http://smartdefine.org/cosmic_ray/definitions/1324887
ChicagoWordNet. 2010. "cosmic ray" http://smartdefine.org/cosmic_ray/definitions/1324887 (accessed September 20, 2026).
HarvardWordNet 2010, cosmic ray, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/cosmic_ray/definitions/1324887>.
MLAWordNet. "cosmic ray" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/cosmic_ray/definitions/1324887>