1. a substance that reduces the surface tension of a liquid, allowing it to spread more easily
Usage: chemistry; technical
2. a substance produced in the lungs that helps keep the air sacs open during breathing
Usage: medical; biology

Examples

• Soap acts as a surfactant, helping water penetrate and clean fabric.
• The detergent contains surfactants that break down grease and oil.
• Premature babies often lack sufficient surfactant in their lungs.
• Scientists studied how surfactants affect oil spill cleanup efforts.
• The shampoo’s surfactants create foam while removing dirt from hair.
• Doctors may give artificial surfactant to newborns with breathing problems.