Definition of nanometre noun from the Oxford Advanced Learner's Dictionary

 

nanometre

 noun
(especially US English nanometer)noun
BrE BrE//ˈnænəʊmiːtə(r)//
 
; NAmE NAmE//ˈnænoʊmiːtər//
 
(abbreviation nm)
 
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one thousand millionth of a metre