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

 

electro-

 combining form
combining form
BrE BrE//ɪˈlektrəʊ//
 
; NAmE NAmE//ɪˈlektroʊ//
 
 
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(in nouns, adjectives, verbs and adverbs) connected with electricity electromagnetism
See the Oxford Advanced American Dictionary entry: electro-