hyperon

Noun
  1. Any baryon that is not a nucleon;
    Unstable particle with mass greater than a neutron (synset 109331148)
    is a type of: 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
    subtypes: lambda hyperon, lambda particle - an electrically neutral baryon with isotopic spin 1

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