From Longman Dictionary of Contemporary Englishdouble-blindˌdouble-ˈblind adjective technical HMa double-blind scientific test or study compares two groups in which neither the scientists nor the people being studied know which group is being tested and which group is not
Examples from the Corpus
double-blind• One study did not use a double-blind design and was therefore excluded from the analysis.• Convincing them otherwise would take double-blind trials and a plausible explanation of how the sensitivity might arise.• To eliminate this, as in double-blind trials, would in many cases render the therapy impotent. 