Standard Lemma guide

butyl

noun · 3 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

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ˈbjuːtɪl/
  • /ˈbjuːtaɪl/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: B Y UW1 T AH0 L Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

Any of four isomeric univalent hydrocarbon radicals, C4H9, formally derived from butane by the loss of a hydrogen atom.

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, organic-chemistry, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A synthetic rubber made by the polymerization of isobutylene.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

a hydrocarbon radical (C4H9)

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: group, radical, chemical group

History

Etymology

PIE word *gwṓws Etymology tree Proto-Indo-European *gwṓws Proto-Hellenic *gwous Ancient Greek βοῦς (boûs) Proto-Indo-European *tewh2- Proto-Indo-European *-rós Proto-Indo-European *tuh2rós Proto-Hellenic *tūrós Ancient Greek τῡρός (tūrós) Ancient Greek βούτῡρος (boútūros)der. English but- Proto-Indo-European *swel-der.? Ancient Greek ῡ̔́λη (hū́lē)der. Frenchder. English -yl English butyl From but- + -yl.

Across languages

Translations

8 source translations are retained for this English entry.

  • Catalan: butil — any of four isomeric univalent hydrocarbon radicals, C4H9
  • Finnish: butyyli — any of four isomeric univalent hydrocarbon radicals, C4H9
  • German: Butyl — any of four isomeric univalent hydrocarbon radicals, C4H9
  • Italian: butile — any of four isomeric univalent hydrocarbon radicals, C4H9
  • Portuguese: butil — any of four isomeric univalent hydrocarbon radicals, C4H9
  • Portuguese: butilo — any of four isomeric univalent hydrocarbon radicals, C4H9
  • Romanian: butil — any of four isomeric univalent hydrocarbon radicals, C4H9
  • Spanish: butilo — any of four isomeric univalent hydrocarbon radicals, C4H9
Real reading context

butyl in complete knowledge articles