Definition of quark
: any of several elementary particles that are postulated to come in pairs (as in the up and down varieties) of similar mass with one member having a charge of +2⁄3 and the other a charge of −1⁄3 and are held to make up hadrons
Recent Examples of quark from the Web
Theorists in the 1970s posited a relationship between the particles that carry forces, like the photon that conveys electromagnetism or light, and the basic constituents of matter, electrons and quarks.
What surprised the researchers was that the flow of quark-gluon plasma caught the heavy D-zero particles.
Then came the Hadron epoch, when the first protons and neutrons formed from quarks, about 1 second after the Big Bang.
Physicists explain the behavior of quarks – the particles that make up atomic nuclei – and the gluons that hold them together with a theory called quantum chromodynamics.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'quark'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of quark
coined by Murray Gell-Mann
First Known Use: 1964See Words from the same year
QUARK Defined for English Language Learners
Definition of quark for English Language Learners
physics : any one of several types of very small particles that make up matter
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