- informal any of various drugs supposed to have the property of making people tell the truth, as by relaxing them
WordReference Random House Unabridged Dictionary of American English © 2020
Drugsa 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.Also, truth′ drug′. Cf. narcoanalysis.
Collins Concise English Dictionary © HarperCollins Publishers::
truth drug, truth serum n
'truth serum' also found in these entries (note: many are not synonyms or translations):