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English definition of “quark”

quark

noun [C] (PHYSICS)    /kwɑːk/ US  /kwɑːrk/ specialized
one of the most basic forms of matter that make up the heavier elementary particles : Atoms are made up of smaller particles - protons , neutrons and electrons - some of which are made up of even smaller ones , called quarks.Atoms, molecules and sub-atomic particles
(Definition of quark noun (PHYSICS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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