surfactant

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sur⋅fac⋅tant

[ser-fak-tuh

nt]

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–noun Chemistry.

surface-active agent.

Origin:
1945–50; shortening of surf(ace)-act(ive) a(ge)nt

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sur⋅face-ac⋅tive a⋅gent

[sur-fis-ak-tiv]

–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.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To surfactant

sur·fac·tant (sər-fāk'tənt, sûr'fāk'-)

A surface-active substance.
A substance composed of lipoprotein that is secreted by the alveolar cells of the lung and serves to maintain the stability of pulmonary tissue by reducing the surface tension of fluids that coat the lung.

[surf(ace)-act(ive) + a(ge)nt.]

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: sur·fac·tant
Pronunciation: (")s&r-'fak-t&nt, 's&r-"
Function: noun
: a surface-active substance; specifically : a surface-active lipoprotein mixture which coats the alveoli and which prevents collapse of the lungs by reducing the surface tension of pulmonary fluids —surfactant adjective

Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

surfactant sur·fac·tant (sər-fāk'tənt, sûr'fāk'-)
n.

A surface-active substance.
A substance composed of lipoprotein that is secreted by the alveolar cells of the lung and serves to maintain the stability of pulmonary tissue by reducing the surface tension of fluids that coat the lung.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary

surfactant (sər-fāk'tənt) Pronunciation Key

A substance that, when dissolved in water, lowers the surface tension of the water and increases the solubility of organic compounds. Surfactants are used in inks to increase the effects of capillary action; detergents are surfactants that help remove organic compounds from a substance by making them dissolve more readily in the water in which the substance is washed.
A substance composed of lipoprotein that is secreted by the alveolar cells of the lung and maintains the stability of pulmonary tissue by reducing the surface tension of fluids that coat the lung.

Encyclopedia

surfactant

substance such as a detergent that, when added to a liquid, reduces its surface tension, thereby increasing its spreading and wetting properties. In the dyeing of textiles, surface-active agents help the dye penetrate the fabric evenly. They are used to disperse aqueous suspensions of insoluble dyes and perfumes.

Learn more about surfactant with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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