| NOUN | object | alpha particle | a positively charged particle that is the nucleus of the helium atom |
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| Meaning | A positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes. | |
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| Broader | particle, subatomic particle | A body having finite mass and internal structure but negligible dimensions |
| Spanish | partícula alfa | |
| Catalan | partícula alfa | |
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