D defs.my
Entry 1 sense Webster, 1913

hyperon

· IPA /ˈhaɪpəɹɒn/
01 n. Any baryon that is not a nucleon; it is an unstable particle with a mass greater than that of a neutron.
  1. 1.
    Any baryon that is not a nucleon; it is an unstable particle with a mass greater than that of a neutron.(Physics)