subnuclear particle

[suhb-noo-klee-er, -nyoo- or, by metathesis, -kyuh-ler]
noun Physics.
any of the elementary particles, including those that do not exist in stable matter but appear as a result of high-energy collisions of other particles or nuclei.

1960–65; sub- + nuclear

See nuclear. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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