Medical Definition of phospholipid
: any of various phosphorus-containing complex lipids (such as lecithins and phosphatidylethanolamines) that are derived from glycerol and are major constituents of the membranes of cells and intracellular organelles and vesicles ◆Phospholipids typically consist of a hydrophilic polar phosphate head and a hydrophobic tail of two fatty acids. In aqueous environments, phospholipids typically form semipermeable bilayers in which the hydrophilic heads point outward and the hydrophobic tails point inward toward each other. —called also ,
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