Definition of nano- combining form from the Oxford Advanced Learner's Dictionary

 

nano-

 combining form
combining form
BrE BrE//ˈnænəʊ//
 
; NAmE NAmE//ˈnænoʊ//
 
(specialist)
 
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(in nouns and adjectives; used especially in units of measurement) one billionth nanosecond Word Originvia Latin from Greek nanos ‘dwarf’.
See the Oxford Advanced American Dictionary entry: nano-