Standard Lemma guide

pentobarbital

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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  • General-American: /ˌpɛn.təˈbɑɹ.bəˌtɔl/

1

noun

Meaning 1

A narcotic and sedative barbiturate drug (trademark Nembutal) formerly used to relieve insomnia.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: medicine, pharmacology, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: pentobarbital sodium, Nembutal, yellow jacket

Antonyms: none provided

Broader terms: barbiturate

History

Etymology

From pent(yl) + -o- + barbital.