noun
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(uncountable) The chemical element (symbol C) with an atomic number of 6. It can be found in pure form for example as graphite, a black, shiny and very soft material, or diamond, a colourless, transparent, crystalline solid and the hardest known material.
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(countable) An atom of this element, in reference to a molecule containing it.
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(countable, informal) A sheet of carbon paper.
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(countable, informal) A carbon copy.
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A fossil fuel that is made of impure carbon such as coal or charcoal.
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(ecology, climate change, uncountable) Ellipsis of carbon dioxide.
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A carbon rod or pencil used in an arc lamp.
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A plate or piece of carbon used as one of the elements of a voltaic battery.
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(informal) Ellipsis of carbon fiber (reinforced polymer).