carbon noun (SUBSTANCE)
B2 symbol C [ U ] a chemical element that exists in its pure form as diamond or graphite, and is an important part of other substances such as coal and oil, as well as being contained in all plants and animals
(Definition of “carbon” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
(Definition of “carbon” from the Cambridge Academic Content Dictionary © Cambridge University Press)
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