Nouns starting with C

• carbon cycle — Noun – English ～ a thermonuclear reaction in the interior of stars
• cardiac cycle — Noun – English ～ the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles; "the cardiac cycle can be shown on an electrocardiogram"
• carbon cycle — Noun – English ～ the organic circulation of carbon from the atmosphere into organisms and back again
• citric acid cycle — Noun – English ～ in all plants and animals: a series of enzymatic reactions in mitochondria involving oxidative metabolism of acetyl compounds to produce high-energy phosphate compounds that are the source of cellular energy
• cyclicity — Noun – English ～ the quality of recurring at regular intervals
• cycling — Noun – English ～ the sport of traveling on a bicycle or motorcycle
• Cycliophora — Noun – English ～ tiny marine organisms each the size of a period found in great numbers on lobsters' lips; identified tentatively in 1995 as a new phylum or as possible link between Entoprocta and Ectoprocta
• cyclist — Noun – English ～ a person who rides a bicycle
• cyclobenzaprine — Noun – English ～ muscle relaxant (trade name Flexeril) used for muscle spasms or acute injury
• cyclohexanol — Noun – English ～ a colorless oily alcohol that smells like camphor
• cycloid — Noun – English ～ a line generated by a point on a circle rolling along a straight line
• curtate cycloid — Noun – English ～ a cycloid generated by a point inside the rolling circle
• Cycloloma — Noun – English ～ a caryophyllaceous genus of the family Chenopodiaceae
• Cycloloma atriplicifolium — Noun – English ～ bushy annual weed of central North America having greenish flowers and winged seeds
• cyclone — Noun – English ～ (meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern
• cyclone — Noun – English ～ a violent rotating windstorm
• cyclone cellar — Noun – English ～ an underground shelter where you can go until a storm passes
• cyclooxygenase-1 — Noun – English ～ an enzyme that regulates prostaglandins that are important for the health of the stomach lining and kidneys; "an unfortunate side effect of NSAIDs is that they block Cox-1"
• cyclooxygenase-2 — Noun – English ～ an enzyme that makes prostaglandins that cause inflammation and pain and fever; "the beneficial effects of NSAIDs result from their ability to block Cox-2"
• cyclooxygenase — Noun – English ～ either of two related enzymes that control the production of prostaglandins and are blocked by aspirin

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