Standard Lemma guide

formaldehyde

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.

  • /fɔː(ɹ)ˈmældɪhaɪd/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: F AO0 R M AE1 L D AH0 HH AY2 D Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
  • CMU ARPABET 2: F ER0 M AE1 L D AH0 HH AY2 D Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

The simplest aldehyde, HCHO, a colourless gas that has many industrial applications; it dissolves in water to give formol (10%) and formalin.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

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 colorless poisonous gas; made by the oxidation of methanol

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: methanal

Antonyms: none provided

Broader terms: aldehyde, gas

History

Etymology

Etymology tree English form(yl) Akkadian 𒎎𒋆𒁉𒍣𒁕 (guḫlum)bor. Aramaic כוחלא (kuḥlā)bor. Arabic كُحْل (kuḥl) Andalusian Arabic اَلْكُحُول (al-kuḥūl)bor. Latin alcoholder. Proto-Indo-European *de Proto-Indo-European *-h1 Proto-Indo-European *déh1 Proto-Italic *dē Latin dē Latin de-der. Proto-Indo-European *wed- Proto-Indo-European *-r̥ Proto-Indo-European *wódr̥ Proto-Hellenic *údōr Ancient Greek ῡ̆̔́δωρ (hū̆́dōr) Ancient Greek ῠ̔δρο- (hŭdro-)der. German Aldehydbor. English aldehyde English formaldehyde From form(yl) + aldehyde.

Across languages

Translations

41 source translations are retained for this English entry.

  • Belarusian: фармальдэгі́д (farmalʹdehíd) — the organic compound HCHO
  • Catalan: formaldehid — the organic compound HCHO
  • Chinese Cantonese: 甲醛 (gaap3 cyun4) — the organic compound HCHO
  • Chinese Cantonese: 蟻醛 /蚁醛 (ngai5 cyun4) — the organic compound HCHO
  • Chinese Mandarin: 甲醛 (jiǎquán) — the organic compound HCHO
  • Chinese Mandarin: 蟻醛 /蚁醛 (yǐquán) — the organic compound HCHO
  • Czech: formaldehyd — the organic compound HCHO
  • Danish: formaldehyd — the organic compound HCHO
  • Dutch: formaldehyde — the organic compound HCHO
  • Esperanto: formaldehido — the organic compound HCHO
  • Finnish: formaldehydi — the organic compound HCHO
  • French: formaldéhyde — the organic compound HCHO
  • German: Formaldehyd — the organic compound HCHO
  • Greek: φορμαλδεΰδη (formaldeÿ́di) — the organic compound HCHO
  • Hebrew: פורמלין (formalín) — the organic compound HCHO
  • Hindi: वम्रसुव्युद (vamrasuvyud) — the organic compound HCHO
  • Hungarian: formaldehid — the organic compound HCHO
  • Ido: formaldehido — the organic compound HCHO
  • Ido: metanalo — the organic compound HCHO
  • Indonesian: formaldehida — the organic compound HCHO
  • Italian: formaldeide — the organic compound HCHO
  • Japanese: ホルムアルデヒド (horumuarudehido) — the organic compound HCHO
  • Korean: 폼알데하이드 (pomaldehaideu) — the organic compound HCHO
  • Latvian: formaldehīds — the organic compound HCHO
  • Lithuanian: formaldehidas — the organic compound HCHO
  • Malay: formaldehid — the organic compound HCHO
  • Malay: metanal — the organic compound HCHO
  • Persian: فرمالدئید (formâlde'id) — the organic compound HCHO
  • Persian: فرمالدهید (formâldehid) — the organic compound HCHO
  • Polish: aldehyd mrówkowy — the organic compound HCHO
  • Polish: formaldehyd — the organic compound HCHO
  • Polish: metanal — the organic compound HCHO
  • Portuguese: formaldeído — the organic compound HCHO
  • Romanian: formaldehidă — the organic compound HCHO
  • Russian: формальдеги́д (formalʹdɛgíd) — the organic compound HCHO
  • Spanish: formaldehído — the organic compound HCHO
  • Swedish: formaldehyd — the organic compound HCHO
  • Thai: ฟอร์มาลดีไฮด์ — the organic compound HCHO
  • Turkish: formaldehit — the organic compound HCHO
  • Ukrainian: формальдегі́д (formalʹdehíd) — the organic compound HCHO
  • Vietnamese: fomanđêhít — the organic compound HCHO
Real reading context

formaldehyde in complete knowledge articles