a unit of time equal to the time that a photon would take to traverse the diameter of an electron: about 10–24 seconds
chronon in American English
(ˈkrounɑn)
noun
a hypothetical unit of time, taken as a ratio between the diameter of the electron and the velocity of light, equivalent to approximately 10−24second
Word origin
[1975–80; ‹ Gk chron(os) time + -on1]This word is first recorded in the period 1975–80. Other words that entered Englishat around the same time include: family therapy, gridlock, hybridoma, methanogen, surrogate mother-on is a suffix used in the names of subatomic particles (gluon; meson; neutron), quanta (graviton), and other minimal entities or components (cistron; codon; magneton; photon)