Definitions for "Double Blind"
A type of study in which neither the subject taking the drug nor the investigator giving them the drug know whether it is the active, real drug or a placebo.
An experimental design, often used in drug research, in which neither the investigator nor the patients know which subjects are in the treatment and which in the nontreatment condition until the experiment has been completed.
an experimental method by which both the subject and the experimenter are unaware of the nature of a given treatment; this design helps to avoid bias in experimental studies.