lipid bilayer

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lipid bilayer

[¦lip·id ′bī‚lā·ər]
(cell and molecular biology)
The foundational structure of plasma membranes; it is composed of two layers of phospholipids positioned such that their polar hydrophilic heads face outward and their nonpolar hydrophobic tails are directed inward, blocking entry of water and water-soluble material into the cell.