Hydrocarbons

n. compound composed of carbon and hydrogen (Chemistry)

In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. With relation to chemical terminology,  aromatic hydrocarbons or arenes, alkanes, alkenes and alkyne-based compounds composed entirely of carbon or hydrogen are referred to as "Pure" hydrocarbons, whereas other hydrocarbons with bonded compounds or impurities of sulphur or nitrogen, are referred to as "impure", and remain somewhat erroneously referred to as hydrocarbons.
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Hydrocarbons, n.pl compounds that only contain carbon and hydrogen atoms, such as alkanes, alkenes, alkynes, terpenes, and arenes. [more]Hydrocarbons - Community and Resources

Noun
1. an organic compound containing only carbon and hydrogen
(hypernym) organic compound
(hyponym) chlorobenzene

Chemical compounds that consist entirely of carbon and hydrogen.