hyperon

[n] - any baryon that is not a nucleon
Found on http://www.webdictionary.co.uk/definition.php?query=hyperon

hyperon

A baryon whose strangeness is nonzero; in other words, a baryon that contains at least one strange quark. The lightest hyperon is the A particle, with strangeness -1 and quark composition uds (up-down-strange). The name 'hyperon' comes from the Greek iper meaning 'above' or 'beyond' and wa...
Found on http://www.daviddarling.info/encyclopedia/H/hyperon.html

Hyperon

Heavy unstable (short-lived) particles. Hyperons all have half-integral spin (hyperons are fermions), are more massive than either a proton or neutron, include protons or neutrons as final decay products (hyperons are baryons), interact via the strong and electromagnetic interactions (hyperons are hadrons). Examples are the lambda, sigma, xi, and o...
Found on http://www-bdnew.fnal.gov/operations/accgloss/gloss.html

hyperon

hyperon (hī'puron") , class of elementary particles heavier than nucleons (proton and neutron). The nucleons and the hyperons together make up the baryon family of particles.
Found on http://www.infoplease.com/ce6/sci/A0824764.html

hyperon

quasi-stable member of a class of subatomic particles known as baryons that are composed of three quarks. More massive than their more-familiar ...
Found on http://www.britannica.com/eb/a-z/h/91

hyperon

very short-lived elementary particle, with or without electric charge, of spin 1/2 or 3/2, of rest mass greater than that of the neutron
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=393-11-17
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