| NOUN | phenomenon | electron beam, beam, ray | a group of nearly parallel lines of electromagnetic radiation |
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| Meaning | A group of nearly parallel lines of electromagnetic radiation. | |
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| Synonyms | beam, ray | |
| Narrower | cathode ray | A beam of electrons emitted by the cathode of an electrical discharge tube |
| particle beam | A collimated flow of particles (atoms or electrons or molecules) | |
| Broader | electromagnetic radiation, electromagnetic wave, nonparticulate radiation | Radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge |
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