English

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

 

atto-

 combining form
combining form
BrE BrE//ˈætəʊ//
 
; NAmE NAmE//ˈætoʊ//
 
 
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(in units of measurement) a factor of 10-18 200 attowatts Word Originfrom Danish or Norwegian atten ‘eighteen’.
See the Oxford Advanced American Dictionary entry: atto-