Truth Serum Definition

noun
An anesthetic or hypnotic, as thiopental sodium, regarded as tending to make a subject responsive while being questioned.
Webster's New World

(informal, medicine) A psychoactive medication, especially one administered by injection, which supposedly renders a person cooperative and disposed to respond honestly to questions.

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Other Word Forms of Truth Serum

Noun

Singular:
truth serum
Plural:
truth serums

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