1. thin layers of tissue that cover, line, or connect parts of the body
Usage: biology; anatomy
2. thin flexible sheets of material that allow certain substances to pass through
Usage: chemistry; engineering

Examples

• The cell membranes control what enters and exits the cell.
• Mucous membranes line the inside of the nose and mouth.
• The water filter uses special membranes to remove impurities.
• Scientists studied the permeability of the artificial membranes.
• The baby’s amniotic membranes protect it during development.
• These synthetic membranes can separate different gases.
• The ear drum is made of delicate membranes that vibrate with sound.