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Meaning of single-blind

sin•gle-blind

Pronunciation: (sing'gul-blīnd'), [key]
— adj.
  1. of or pertaining 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. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.