A structure bounding a cell or cell organelle; it contains lipids, proteins, glycolipids, steroids, etc. SYN: membrane (2).
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bio·mem·brane -'mem-.brān n a membrane either on the surface or interior of a cell that is composed of protein and lipid esp. in sheets only a few molecules thick and that limits the diffusion and transport of materials
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bio·mem·brane (bi″o-memґbrān) the lipid bilayer, together with integral and peripheral proteins, that surrounds cells and organelles. biomembranous adjMedical dictionary. 2011.