truth serum

[ trooth-seer-uhm ]
/ ˈtruθ ˌsɪər əm /

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.

QUIZZES

THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?

Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
Question 1 of 8
Mississippi’s nickname comes from the magnificent trees that grow there. What is it?
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. 2020

Example sentences from the Web for truth serum

  • Then, abruptly, "Are you sure that was truth-serum in that hypodermic?"

    Man of Many Minds|E. Everett Evans
  • 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
  • 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)

Medical definitions for truth serum

truth serum
[ trōōth ]

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.