double-blind

adjective
dou·​ble-blind | \ˌdə-bəl-ˈblīnd \

Definition of double-blind 

: of, relating to, or being an experimental procedure in which neither the subjects nor the experimenters know which subjects are in the test and control groups during the actual course of the experiments — compare open-label, single-blind

First Known Use of double-blind

1950, in the meaning defined above

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The first known use of double-blind was in 1950

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double-blind

adjective
dou·​ble-blind | \ˌdəb-əl-ˈblīnd \

Medical Definition of double-blind 

: of, relating to, or being an experimental procedure in which neither the subjects nor the experimenters know which subjects are in the test and control groups during the actual course of the experiments — compare open-label, single-blind

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