"zeptosecond." YourDictionary, n.d. Web. 19 October 2018. <http://www.yourdictionary.com/zeptosecond>.
zeptosecond. (n.d.). Retrieved October 19th, 2018, from http://www.yourdictionary.com/zeptosecond
zepto- +"Ž second
One sextillionth of a second. See space/time.
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