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double–blind

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double–blind /ˌdʌbəlˈblaɪnd/ adjective
double–blind
/ˌdʌbəlˈblaɪnd/
adjective
Britannica Dictionary definition of DOUBLE–BLIND
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 experiment know which of the groups being studied is the control group and which is the test group