Definition of axion
: a hypothetical subatomic particle of low mass and energy that is postulated to exist because of certain properties of the strong force
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Recent Examples of axion from the Web
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The hunt for wispy particles called axions, which might make up the dark matter whose gravity keeps galaxies from falling apart, is heating up.
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Or hypothesized particles called axions that interact with magnetic fields might be detected in laboratories or in space.
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Origin and Etymology of axion
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