American Heritage® Dictionary of the English Language, Fourth Edition
- 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.
- n. informal, medicine A psychoactive medication, especially one administered by injection, which supposedly renders a person cooperative and disposed to respond honestly to questions.
- n. an intravenous anesthetic drug that has a hypnotic effect; induces relaxation and weakens inhibitions; is believed to induce people to talk freely
“Put a little truth serum in me and you’ll find out that Tori Spelling goes by Chloe Birkin, rescues dogs in her spare time, and would rather not use packaged marshmallows anymore.”
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