pion - WordReference.com Dictionary of English

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  - pioneer
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pion

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Concise Oxford English Dictionary © 2008 Oxford University Press:
pion /ˈpʌɪɒn/

▶noun Physics a meson having a mass approximately 270 times that of an electron.

– derivatives
pionic adjective.

– origin 1950s: from pi1 (the letter used as a symbol for the particle) + -on.

'pion' also found in these Oxford entries:

kaon - pi-meson - propionic acid

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