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eta-c meson

[ey-tuh-see, ee-tuh-] /ˈeɪ təˈsi, ˈi tə-/
noun, Physics.
1.
a neutral meson having a mass 5832 times that of the electron and a mean lifetime of approximately 3.1 × 10 -22 seconds.
Also called eta-c particle.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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