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Yukawa meson

noun Physics.
  1. a hypothetical elementary particle with finite rest mass, whose exchange between nucleons would account for the strong short-range forces between nucleons: subsequently identified as the pion.
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Origin of Yukawa meson

First recorded in 1960–65; after H. Yukawa
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018