Solid alcohol, also known as sterol, is an organic compound composed of a hydroxyl group attached to a saturated hydrocarbon chain. It is a type of lipid found in the cell membranes of animals and plants, and is essential for the proper functioning of the body. Sterols are important components of human nutrition, and are found in many foods such as eggs, dairy products, and nuts. They are also used in the production of pharmaceuticals and cosmetics.