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WordReference Random House Unabridged Dictionary of American English © 2024ka•on (kā′on),USA pronunciation n. [Physics.]- Physicsa 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.
- ka- (spelling, spelled of name of letter k) + (mes)on 1955–60
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