Oil 2 topics · 2 sources ScienceWaterDefined as oil of any kind or in any form including, but not limited to, petroleum, fuel oil, sludge, oil refuse, and oil mixed with wastes. Bureau of Reclamation — Bureau of Reclamation Glossary Cite Science› WeatherClimate ChangeSee crude oil, petroleum, fossil fuel, hydrocarbons.EPA — Global Warming Glossary of Climate Change Terms Cite