An abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds WordNet 3.0 & Open English WordNet

Carbon is a chemical element; it has symbol C and atomic number 6. Wikipedia

Chemical element with symbol C and atomic number 6. Wikipedia Disambiguation

Chemical element with symbol C and atomic number 6; common element of all known life Wikidata

A nonmetallic element with symbol C and atomic number 6 existing in the three crystalline forms: graphite, diamond and buckminsterfullerene: occurring in carbon dioxide, coal, oil and all organic compounds. OmegaWiki

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. Wiktionary

Chemical element. Wiktionary (translation)