of or relating to an experiment or clinical trial in which the researchers but not the subjects know which subjects are receiving the active medication or treatment and which are not: a technique for eliminating subjective bias, as the placebo effect, from the test results.
of or relating to an experiment, esp one to discover people's reactions to certain commodities, drugs, etc, in which the experimenters but not the subjects know the particulars of the test items during the experimentCompare double-blind
A testing procedure in which the administrators do not tell the subjects if they are being given a test treatment or a control treatment, used in an effort to avoid accidental bias in the results.
