Phrase guide

truth serum

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

noun

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Usage: countable, informal, uncountable

Topics: medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: truth drug

Antonyms: none provided

2

noun

Meaning 2

an intravenous anesthetic drug that has a hypnotic effect; induces relaxation and weakens inhibitions; is believed to induce people to talk freely

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: truth drug

Antonyms: none provided

Broader terms: intravenous anesthetic

Narrower terms: amobarbital, thiopental, thiopental sodium, thiopentobarbital sodium, Pentothal

History

Etymology

No etymology was provided for this word.

Across languages

Translations

6 source translations are retained for this English entry.

  • Chinese Mandarin: 吐真劑 /吐真剂 (tǔzhēnjì) — truth serum
  • Finnish: totuusseerumi — truth serum
  • French: sérum de vérité — truth serum
  • Greek: όρος της αλήθειας (óros tis alítheias) — truth serum
  • Polish: serum prawdy — truth serum
  • Russian: сы́воротка пра́вды (sývorotka právdy) — truth serum