Standard Lemma guide

pyrolysis

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

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.

  • Received-Pronunciation: /paɪˈɹɒlɪsɪs/
  • Received-Pronunciation: /pɪˈɹɒlɪsɪs/
  • General-American: /paɪˈɹɑləsɪs/
  • US: Recorded audio is listed in the source snapshot.
  • Australian: /pɑɪˈɹɔlɪsɪs/
  • rhymes with -ɒlɪsɪs

1

noun

Meaning 1

The decomposition of a material or compound by heat, in the absence of oxygen or other reagents.

Definition source: English Wiktionary via Wiktextract

Usage: countable, physical, uncountable

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: lysis, decomposition, breakdown

2

noun

Meaning 2

transformation of a substance produced by the action of heat

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: transformation, transmutation, shift

History

Etymology

Etymology tree Proto-Indo-European *péh2wr̥ Proto-Hellenic *pāwər Ancient Greek πῦρ (pûr) Latin pyr English pyro- Proto-Indo-European *lewh1-der. Ancient Greek λύω (lúō) Proto-Indo-European *-tis Ancient Greek -τις (-tis) Ancient Greek -σις (-sis) Ancient Greek λῠ́σῐς (lŭ́sĭs)der. English -lysis English pyrolysis From pyro- + -lysis.

Across languages

Translations

22 source translations are retained for this English entry.

  • Basque: pirolisi — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Breton: gwrezrannadur — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Catalan: piròlisi — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Chinese Mandarin: 熱解 /热解 (rèjiě) — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Chinese Mandarin: 熱裂解 /热裂解 (rèlièjiě) — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Czech: pyrolýza — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Esperanto: pirolizo — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Finnish: pyrolyysi — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • French: pyrolyse — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • German: Pyrolyse — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Greek: πυρόλυση (pyrólysi) — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Hungarian: pirolízis — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Italian: pirolisi — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Japanese: 熱分解 (netsubunkai) — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Kazakh: пиролиз (piroliz) — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Polish: piroliza — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Portuguese: pirólise — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Russian: пиро́лиз (piróliz) — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Serbo-Croatian: piroliza — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Spanish: pirólisis — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Tagalog: apuybilos — decomposition of a material or compound due to heat where there is no oxygen or other reagents
  • Turkish: piroliz — decomposition of a material or compound due to heat where there is no oxygen or other reagents