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surface-active agent

[sur-fis-ak-tiv] /ˈsɜr fɪsˌæk tɪv/
noun, Chemistry
1.
any substance that when dissolved in water or an aqueous solution reduces its surface tension or the interfacial tension between it and another liquid.
Also called surfactant.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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