chronon

chronon

[kroh-non]
noun
a hypothetical unit of time, taken as a ratio between the diameter of the electron and the velocity of light, equivalent to approximately 10− 24 second.

Origin:
1975–80; < Greek chron(os) time + -on1

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World English Dictionary
chronon (ˈkrəʊnɒn)
 
n
a unit of time equal to the time that a photon would take to traverse the diameter of an electron: about 10--24 seconds

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