"zeptosecond." YourDictionary, n.d. Web. 14 July 2019. <https://www.yourdictionary.com/zeptosecond>.
zeptosecond. (n.d.). Retrieved July 14th, 2019, from https://www.yourdictionary.com/zeptosecond
zepto- +"Ž second
One sextillionth of a second. See space/time.
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