[ foh-toh-proh-ton ]
/ ˌfoʊ toʊˈproʊ tɒn /

noun Physics.

a proton emitted from a nucleus during photodisintegration.


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Origin of photoproton

First recorded in 1930–35; photo- + proton Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020