Meaning of proton

pro•ton

Pronunciation: (prō'ton), [key]
— n. Physics, Chem.
  1. a 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 , and a mass of 1.673 × 10− kg. Symbol: P
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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