noun Physics.
a meson with strangeness +1 and either positive or zero electric charge, or its antiparticle, with strangeness −1 and either negative or zero electric charge. Symbol: K
Also called K meson, K-meson.

1955–60; ka- (spelling of name of letter k) + (mes)on

kaonic, adjective
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World English Dictionary
kaon (ˈkeɪɒn)
Also called: K-meson a meson that has a positive or negative charge and a rest mass of about 966 electron masses, or no charge and a rest mass of 974 electron masses
[C20: ka representing the letter k + (mes)on]

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American Heritage
Science Dictionary
kaon   (kā'ŏn')  Pronunciation Key 
Any of three unstable mesons, one having charge +1 and a mass of 966 electron masses, and two being electrically neutral, with a mass 974 electron masses. Their half-life is approximately 10-8 seconds, and they decay through the weak force. Their decay patterns suggest that CP invariance may be violated. Also called K-meson, K particle. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The kaon peak is an order of magnitude above the background level between it
  and the pion peak.
But the effects of the process that causes an excess of matter from kaon decays
  are too small to complete the picture.
There are a certain amount of electron neutrino events inherent in the beam,
  which come from kaon decays.
Kaon production vs participants in nuclear collisions.
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