any baryon with strangeness other than zero, especially one with a relatively long lifetime.
Origin of hyperon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
physics any baryon that is not a nucleon
Word Origin for hyperon
C20: from hyper- + -on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Any of various baryons, other than the proton and neutron, that are unstable. The lambda particle is such an example. Hyperons are heavier than protons and neutrons, and they have nonzero strangeness.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.