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Definition of quark noun from the Oxford Advanced American Dictionary

 

quark

 noun
noun
NAmE//kwɔrk//
 
, NAmE//kwɑrk//
 
(physics)
 
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a very small part of matter (= a substance). There are several types of quarks and it is thought that protons, neutrons, etc. are formed from them.
See the Oxford Advanced Learner's Dictionary entry: quark