hy·dro·car·bon 
(hī′drə-kärbən)
(hī′drə-kärbən)n.
Any of numerous organic compounds, such as benzene and methane, that contain only carbon and hydrogen.
hy′dro·car′bo·naceous (-bə-nāshəs), hy′dro·car·bonic (-bŏnĭk), hy′dro·carbon·ous (-bə-nəs) adj.