[trooth seer-uh m]
- 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.
Often truth drug [trooth druhg] /ˈtruθ ˌdrʌg/.
Origin of truth serum
First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for truth serum
Then, abruptly, "Are you sure that was truth-serum in that hypodermic?"
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?
- 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.