Definition of double-blind adjective from the Oxford Advanced American Dictionary

 

double-blind

 adjective
adjective
 
[only before noun]
 
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(of a test) conducted so that none of the 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 Learner's Dictionary entry: double-blind