membranes
n. countablen. thin layers of material that act like a skin, covering parts of a body or a cell. They let some things pass through while keeping others out.
n. thin, pliable layers of tissue that line organs or connect structures within an organism; in biology, the semi-permeable lipid bilayer surrounding a cell.
The cell membrane protects the internal parts of the cell.
Doctors found that the protective membranes around the patient's lungs were slightly inflamed, causing pain during deep breaths.
Advanced filtration systems utilize synthetic membranes to desalinate seawater, mimicking the selective permeability found in biological systems to separate salt ions from water molecules.
Often appears in the plural when referring to biological structures or layers.