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Definition of diagnostic adjective from the Oxford Advanced Learner's Dictionary

 

diagnostic

 adjective
adjective
BrE BrE//ˌdaɪəɡˈnɒstɪk//
 
; NAmE NAmE//ˌdaɪəɡˈnɑːstɪk//
 
Medical examinations
 
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[usually before noun] (specialist) connected with identifying something, especially an illness to carry out diagnostic assessments/tests specific conditions which are diagnostic of AIDS See related entries: Medical examinations Word Origin early 17th cent.: from Greek diagnōstikos ‘able to distinguish’, from diagignōskein ‘distinguish’; the noun from hē diagnōstikē tekhnē ‘the art of distinguishing (disease)’.
See the Oxford Advanced American Dictionary entry: diagnostic

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