What do a.m. and p.m. stand for?


[key-on] /ˈkeɪ ɒn/
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.
Origin of kaon
1955-60; ka- (spelling of name of letter k) + (mes)on
Related forms
kaonic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for kaon
  • 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.
  • The large initial angle resulted in higher relative production of neutral kaon and neutron particles.
  • The sensitivity and specificity were calculated for varying kaon acceptance thresholds.
British Dictionary definitions for kaon


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 Also called K-meson
Word Origin
C20: ka representing the letter k + (mes)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
Cite This Source
kaon in Science
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.
Cite This Source

Word of the Day

Difficulty index for kaon

Some English speakers likely know this word

Word Value for kaon

Scrabble Words With Friends

Nearby words for kaon