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surface-active agent

[sur-fis-ak-tiv] /ˈsɜr fɪsˌæk tɪv/
noun, Chemistry
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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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