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Proton–proton chain reaction

one of the fusion reactions by which stars convert hydrogen to helium

Pronunciation
/ˈprəʊtɒn – ˈprəʊtɒn ʧeɪn rɪˈakʃən/
/ˈproʊˌtɑn – ˈproʊˌtɑn ʧeɪn riˈækʃən/