A structure consisting of two layers, especially the double layer of molecules that forms the basis of cell membranes.
Compound word from 'bi-' (Latin for two) + 'layer' (from Old French 'liere' meaning to bind), referring to anything made of two distinct layers stacked together.
Every living cell you have is wrapped in a lipid bilayer—a genius invention by nature where fatty molecules arrange themselves with their water-loving heads facing out and their water-fearing tails hidden inside, creating a perfect barrier.
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