surfactant
noun/sɜːˈfæktənt/
/sɜːrˈfæktənt/
[countable, uncountable]- (specialist) a substance that reduces the surface tension of a liquid, often forming bubbles in the liquid
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- (medical) a substance that keeps the lungs working well to prevent breathing problems
Word Origin1950s: from surf(ace)-act(ive) + -ant.
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surfactant