dou·ble–blind 
/ˌdʌbəlˈblaɪnd/ adjective
/ˌdʌbəlˈblaɪnd/ adjective technical — used to describe an experiment that is done so that neither the people who are doing the experiment nor the people who are the subjects of the experiments know which of the groups being studied is the control group and which is the test group ▪ a double-blind drug trial
