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u quark

noun, Physics.
1.
Origin of u quark
1975-1980
1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for u quark
  • The d quark is found to be slightly heavier than the u quark explaining why the neutron is slightly heavier than the proton.

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