Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun cosmic_ray

1 sense of cosmic ray

Sense 1
cosmic ray -- (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)
       => ionizing radiation -- (high-energy radiation capable of producing ionization in substances through which it passes)