Phrase guide

nitrogen cycle

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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1

noun

Meaning 1

The natural circulation of nitrogen, in which atmospheric nitrogen is converted to nitrogen oxides by lightning and deposited in the soil by rain, where it is assimilated by plants and either eaten by animals (and returned as faeces) or decomposed back to elemental nitrogen by bacteria.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: organic process, biological process

History

Etymology

No etymology was provided for this word.

Across languages

Translations

7 source translations are retained for this English entry.

  • Finnish: typen kierto — natural circulation of nitrogen
  • Finnish: typpikierto — natural circulation of nitrogen
  • Irish: timthriall nítrigine — natural circulation of nitrogen
  • Japanese: 窒素循環 (chisso junkan) — natural circulation of nitrogen
  • Māori: hurihanga hauota — natural circulation of nitrogen
  • Polish: cykl azotowy — natural circulation of nitrogen
  • Polish: cykl nitryfikacyjny — natural circulation of nitrogen