Wiktionary
triple-blind
a. Describing an experiment (usually medical) in which the identity of those repeating different treatments is kept secret from the subjects, the administrators, and the statisticians analysing the data until the outcome of the experiment is known. alt. Describing an experiment (usually medical) in which the identity of those repeating different treatments is kept secret from the subjects, the administrators, and the statisticians analysing the data until the outcome of the experiment is known.