cosmic ray

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
Hypernyms: ↑ionizing radiation
Part Holonyms: ↑cosmic radiation

* * *

noun, pl ⋯ rays [count]
technical : a stream of energy that enters the Earth's atmosphere from outer space — usually plural

Useful english dictionary. 2012.

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Look at other dictionaries:

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