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Meaning of proton-proton chain

pro'ton-pro'ton chain"

Pronunciation: (prō'ton-prō'ton), [key]
— Physics., Physics.,Astron.
  1. a series of thermonuclear reactions, responsible for the energy production in stars like the sun, in which the nuclei of hydrogen atoms are transformed into helium nuclei by sequential addition of single hydrogen nuclei.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.