Phrase guide

nitrogen dioxide

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

The binary compound NO2, a brownish gas that is a poisonous air pollutant; it exists in equilibrium with dinitrogen tetroxide. It can be the poisonous result of a nitric acid spill contacting ambient air.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

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

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: NOx, nitrogen oxide, oxide, compound, substance, material

2

noun

Meaning 2

a highly poisonous brown gas (NO2)

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: dioxide, gas

History

Etymology

No etymology was provided for this word.

Across languages

Translations

23 source translations are retained for this English entry.

  • Asturian: dióxidu de nitróxenu — the binary compound NO2
  • Chinese Cantonese: 二氧化氮 (ji6 joeng5 faa3 daam6) — the binary compound NO2
  • Chinese Mandarin: 二氧化氮 (èryǎnghuàdàn) — the binary compound NO2
  • Czech: oxid dusičitý — the binary compound NO2
  • Finnish: typpidioksidi — the binary compound NO2
  • French: dioxyde d'azote — the binary compound NO2
  • German: Stickstoffdioxid — the binary compound NO2
  • German: Nitrogendioxid — the binary compound NO2
  • Hungarian: nitrogén-dioxid — the binary compound NO2
  • Indonesian: nitrogen dioksida — the binary compound NO2
  • Italian: biossido di azoto — the binary compound NO2
  • Italian: diossido di azoto — the binary compound NO2
  • Italian: ipoazotide — the binary compound NO2
  • Japanese: 二酸化窒素 (nisanka chisso) — the binary compound NO2
  • Korean: 이산화질소 (isanhwajilso) — the binary compound NO2
  • Norwegian Bokmål: nitrogendioksid — the binary compound NO2
  • Norwegian Nynorsk: nitrogendioksid — the binary compound NO2
  • Polish: dwutlenek azotu — the binary compound NO2
  • Portuguese: dióxido de nitrogênio — the binary compound NO2
  • Portuguese: dióxido de nitrogénio — the binary compound NO2
  • Portuguese: dióxido de azoto — the binary compound NO2
  • Romanian: dioxid de azot — the binary compound NO2
  • Spanish: dióxido de nitrógeno — the binary compound NO2