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quarks

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  1. In physics, the elementary particles that make up the protons and neutrons that in turn make up the atomic nucleus. Quarks are the most basic known constituent of matter. (See antimatter.)

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No quarks have been seen in the laboratory because, according to current theory, they cannot exist as free particles.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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