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Any of the baryons that are not nucleons, have a mass greater than that of the neutron, and are not stable.
(General Physics) physics any baryon that is not a nucleon
[C20: from hyper- + -on]
any baryon with nonzero strangeness, esp. one with a relatively long lifetime.
[1950–55; < Greek hypér + -on1]
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|Noun||1.||hyperon - any baryon that is not a nucleon; unstable particle with mass greater than a neutron|
baryon, heavy particle - any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1