[kroh-non] /ˈkroʊ nɒn/
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.
a unit of time equal to the time that a photon would take to traverse the diameter of an electron: about 10–24 seconds
chronooncology chron·o·on·col·o·gy (krŏn’ō-ŏn-kŏl’ə-jē, -ŏng-) n.
[kron-uh-fer, kroh-nuh-] /ˈkrɒn ə fər, ˈkroʊ nə-/ noun 1. an instrument for transmitting time signals electronically.
noun a fear of time Word Origin chrono- ‘time’
[kron-oh] /ˈkrɒn oʊ/ noun, plural chronos. 1. .