Kaon definitions

kā'ŏn'
Any of a group of four mesons, one positively charged and one negatively charged, having a mass 966 times that of an electron, and two electrically neutral, having a mass 974 times that of an electron. The two charged kaons have the same mean lifetime, about 1.24 × 10−10 second; the two neutral kaons have lifetimes of about 9 × 10−11 second and 5 × 10−8 second.
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Any of four short-lived mesons that are positive, negative, or neutral and have a mass of 495 MeV/c2 (about 970 times that of an electron)
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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.
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(physics) Any of four unstable subatomic particles, mesons, they are a combination of a strange quark or antiquark and either an up or down quark or antiquark.
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Karlsruhe ontology.
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Origin of kaon

ka pronunciation of the letter K –on