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Dictionary

pro•ton

Pronunciation: (prō'ton), [key]
—n. Physics, Chem.
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 ½, and a mass of 1.673 × 10-²⁷ kg. Symbol: P

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

protomorphic

protonema

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