The term "hydrogenous" refers to substances or materials that are primarily composed of hydrogen. This can include various compounds and elements where hydrogen plays a significant role in their chemical structure. For example, many organic compounds, such as hydrocarbons, are considered hydrogenous because they contain hydrogen atoms bonded to carbon. In a broader context, hydrogenous materials can also be found in natural processes, such as the formation of certain minerals and sediments. These materials are often studied in fields like geology and chemistry to understand their properties and how they interact with other elements, including oxygen and carbon.