down quark definition

  • noun:
    • A quark with a charge of - 1/3 , a mass about 20 times that of the electron, and a downward spin. It is a component of protons and neutrons. See dining table at subatomic particle.
    • A quark having a fractional electric cost of -1/3 and a mass about 4 to 8 MeV. Image: d
    • a stable quark with a power cost of -1/3 and a mass 607 times that an electron
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