oxygen cycle

noun

: the cycle whereby atmospheric oxygen is converted to carbon dioxide in animal respiration and regenerated by green plants in photosynthesis

Example Sentences

Recent Examples on the Web This isn’t a call for protecting biodiversity, as noble a cause as that is, but safeguarding the carbon-to-oxygen cycle and weather regulation services of photosynthesising plants. Solitaire Townsend, Forbes, 8 June 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'oxygen cycle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1935, in the meaning defined above

Time Traveler
The first known use of oxygen cycle was in 1935

Dictionary Entries Near oxygen cycle

Cite this Entry

“Oxygen cycle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/oxygen%20cycle. Accessed 26 Jan. 2023.

More from Merriam-Webster on oxygen cycle

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!


Fashionable Words

  • dog-sunglasses-scarf
  • Which of these items is named for a deadly weapon?
Spell It

Hear a word and type it out. How many can you get right?

TAKE THE QUIZ
Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?

PLAY