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ONADyocto-

yocto-

Flag: gbEnglishOxford New American Dictionary

yocto- /ˈyäːktō-, ˈjɑːktoʊ- /
combining form (used in units of measurement) denoting a factor of 10−24:
yoctojoule.
– ORIGIN adapted from octo-, on the pattern of combining forms such as peta- and exa-.