Search Result for "hyperon": 
Wordnet 3.0

NOUN (1)

1. any baryon that is not a nucleon; unstable particle with mass greater than a neutron; 



The Collaborative International Dictionary of English v.0.48:

hyperon \hyperon\ n. (Physics)
   Any baryon that is not a nucleon; it is an unstable particle
   with a mass greater than that of a neutron.
   [WordNet 1.5]


WordNet (r) 3.0 (2006):

hyperon
    n 1: any baryon that is not a nucleon; unstable particle with
         mass greater than a neutron