double-blind
adjectiveUK /ˌdʌb.əlˈblaɪnd/
US /ˌdʌb.əlˈblaɪnd/
A double-blind test is one where neither the people testing nor the people being tested know who gets the real medicine.
The new medicine was tested in a double-blind study so nobody could cheat.
OTHER MEANINGS
2. A research method where both participants and researchers are kept unaware of key details to prevent bias.
Researchers used a double-blind design to keep the results fair.
3. Describing a situation where two parties each lack information the other has.
Their negotiation was almost double-blind, since neither side knew the other's budget.
4. In computing, a setup where neither the sender nor receiver knows certain routing details.
The double-blind message system hid both identities.