noun Biochemistry.
a structure composed of two molecular layers, especially of phospholipids in cellular membranes.

1960–65; bi-1 + layer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

bilayer bi·lay·er (bī'lā'ər)
A structure, such as a film or membrane, consisting of two molecular layers.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Once you have a basic lipid bilayer, everything else is simple, incremental improvements.
Cholesterol forms part of the lipid bilayer membrane that surrounds each cell in the body.
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