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truth serum

or truth drug

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.
Compare narcoanalysis.
Origin of truth serum
1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for truth-serum
Historical Examples
  • Then, abruptly, "Are you sure that was truth-serum in that hypodermic?"

    Man of Many Minds E. Everett Evans
  • So the doctors gave him truth-serum so he would not try to conceal anything from them.

    The Leader William Fitzgerald Jenkins (AKA Murray Leinster)
  • What sort of talents and abilities did he possess, that he could react thus to a truth-serum?

    Man of Many Minds E. Everett Evans
truth-serum in Medicine

truth serum n.
Any of various hypnotic or anesthetic drugs, such as scopolamine or thiopental sodium, used to induce a subject under questioning to talk without inhibition.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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