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Phospholipid: Definition, Structure, Function | Biology Dictionary A phospholipid is a type of lipid molecule that is the main component of the cell membrane. Lipids are molecules that include fats, waxes, and some vitamins, among others. Each phospholipid is made up of two fatty acids, a phosphate group, and a glycerol molecule. 14.3: Phospholipids in Cell Membranes - Chemistry LibreTexts A phospholipid is a lipid that contains a phosphate group and is a major component of cell membranes. A phospholipid consists of a hydrophilic (water-loving) head and hydrophobic (water-fearing) tail (see figure below). The phospholipid is essentially a triglyceride in which a fatty acid has been replaced by a phosphate group of some sort. Phospholipids - Types, Functions and their Properties - An Overview - BYJUS Phospholipids are compound lipids, consisting of phosphoric acids, nitrogen base, alcohol and fatty acids. These compound lipids are major components of the cell membrane and al...