"yoctosecond." YourDictionary, n.d. Web. 18 December 2018. <https://www.yourdictionary.com/yoctosecond>.
yoctosecond. (n.d.). Retrieved December 18th, 2018, from https://www.yourdictionary.com/yoctosecond
yocto- +"Ž second
One septillionth of a second. See space/time.
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