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truth serum

[ trooth-seer-uhm ]
/ ˈtruθ ˌsɪər əm /
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noun
a drug, as the barbiturate thiopental, that induces in the subject a desire to talk or a state of heightened suggestibility, used in psychotherapy and in interrogation to discover repressed or consciously withheld information.
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Fill in the blank: I can’t figure out _____ gave me this gift.
Often truth drug [trooth-druhg] /ˈtruθ ˌdrʌg/ .
Compare narcoanalysis.

Origin of truth serum

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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