Dictionary.com
definitions
  • synonyms

cosmic ray

See more synonyms for cosmic ray on Thesaurus.com
noun Physics.
  1. a radiation of high penetrating power that originates in outer space and consists partly of high-energy atomic nuclei.
Show More

Origin of cosmic ray

An Americanism dating back to 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for cosmic ray

radiation

Examples from the Web for cosmic ray

Historical Examples of cosmic ray

  • And he pointed to the cosmic-ray skiagraph of the Moon on the curved glass dome overhead.

    Astounding Stories of Super-Science, August 1930

    Various


cosmic ray in Science

cosmic ray

  1. A ray of radiation of extraterrestrial origin, consisting of one or more charged particles such as protons, alpha particles, and larger atomic nuclei. Cosmic rays entering the atmosphere collide with atoms, producing secondary radiation, such as pions, muons, electrons, and gamma rays. Cosmic rays (and secondary radiation) can be easily seen in a cloud chamber.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.