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

 

nano-

 combining form
combining form
NAmE//ˈnænoʊ//
 
, NAmE//ˈnænə//
 
(technology)
 
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(in nouns and adjectives; used especially in units of measurement) one billionth nanosecond nanometer
See the Oxford Advanced Learner's Dictionary entry: nano-