Definition of yocto- combining form from the Oxford Advanced American Dictionary

 

yocto-

 combining form
combining form
NAmE//ˈyɑktoʊ//
 
, NAmE//ˈyɑktə//
 
 
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(in nouns; used in units of measurement) 10⁻24 yoctojoule
See the Oxford Advanced Learner's Dictionary entry: yocto-