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WordReference Random House Learner's Dictionary of American English © 2024pro•ton /ˈproʊtɑn/USA pronunciation n. [countable]- Physicsa positively charged particle found in all atomic nuclei:The number of protons in an atom equals that element's atomic number.
WordReference Random House Unabridged Dictionary of American English © 2024pro•ton (prō′ton),USA pronunciation n. [Physics, Chem.]- Physicsa positively charged elementary particle that is a fundamental constituent of all atomic nuclei. It is the lightest and most stable baryon, having a charge equal in magnitude to that of the electron, a spin of ½, and a mass of 1.673 × 10-27 kg. Symbol: P
- noun, nominal use of Greek prôton, neuter of prôtos first 1915–20
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