Definition

Noun: 1. A thermonuclear reaction in the interior of stars: A series of nuclear fusion reactions that convert carbon into other elements, releasing energy. This process is a crucial source of energy in stars more massive than the Sun. 2. The organic circulation of carbon from the atmosphere into organisms and back again: The continuous process by which carbon atoms move between the Earth's atmosphere, oceans, soil, rocks, and living organisms.

Examples of Usage

• Noun (Astrophysics):
  • The carbon cycle is one of the principal ways stars generate energy.
  • In stellar physics, the carbon cycle describes how carbon acts as a catalyst in hydrogen fusion.
• Noun (Ecology/Biogeochemistry):
  • Plants absorb carbon dioxide during photosynthesis, which is part of the carbon cycle.
  • Understanding the global carbon cycle is essential for climate science.
  • Human activities, like burning fossil fuels, are disrupting the natural carbon cycle.

Advanced Usage

• "to be part of the carbon cycle": to be involved in the biogeochemical process of carbon exchange.
  • All living organisms are part of the carbon cycle.
• "the oceanic carbon cycle": the specific processes of carbon exchange within the Earth's oceans.
  • The oceanic carbon cycle involves the dissolution of atmospheric CO₂ and its use by marine life.

Variants and Related Words

• Carbon-cycle (verb, rare/technical): To subject to or involve in the carbon cycle.
  • The carbon is carbon-cycled through the ecosystem over millennia.
• Carbon sequestration (noun): The long-term storage of carbon, often discussed in the context of managing the carbon cycle to mitigate climate change.
• Nitrogen cycle (noun): A similar biogeochemical cycle for nitrogen, often studied alongside the carbon cycle.

Synonyms

• (For meaning 2): Biogeochemical carbon cycle, carbon flux.
• (For meaning 1): CNO cycle (Carbon-Nitrogen-Oxygen cycle), Bethe-Weizsäcker cycle.

Related Phrases

• Carbon sink: A natural or artificial reservoir that absorbs and stores carbon from the carbon cycle (e.g., forests, oceans).
• Carbon source: A process or reservoir that releases carbon into the carbon cycle (e.g., volcanic eruptions, respiration).

Related Idioms

• There is no established idiom using "carbon cycle." It is a precise scientific term. However, one might metaphorically say:
  • "It's all part of life's carbon cycle" to imply that something is a natural, recurring process of decay and renewal.

Noun

1. a thermonuclear reaction in the interior of stars
2. the organic circulation of carbon from the atmosphere into organisms and back again