English

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

 

proto-

 combining form
combining form
BrE BrE//ˈprəʊtəʊ//
 
; NAmE NAmE//ˈproʊtoʊ//
 
 
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(in nouns and adjectives) original; from which others develop prototype proto-modernist painters Word Originfrom Greek prōtos ‘first’.
See the Oxford Advanced American Dictionary entry: proto-

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