noun
down quark
Technical term in particle physics; one of the fundamental constituents of matter.
陽子はアップクォーク2個とダウンクォーク1個からできている。
A proton is made of two up quarks and one down quark.
Up quark; together with the down quark, it forms protons and neutrons.
Quark; the broader class of elementary particles to which the down quark belongs.
Variant with interpunct; less common but seen in some technical contexts.
Borrowed from English 'down quark', a term coined in the 1960s in particle physics.