Definition of double-blind adjective from the Oxford Advanced Learner's Dictionary

 

double-blind

 adjective
adjective
BrE
 
; NAmE
 
[only before noun]
 
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(of a test) conducted so that neither the organizer nor any other people involved know any information which might influence the results A randomized double-blind study was carried out to test the drug's effectiveness. All articles are subjected to double-blind peer review before publication.
See the Oxford Advanced American Dictionary entry: double-blind