Wetting-agent meaning

wĕtĭng
A substance that reduces the surface tension of water or another liquid, causing the liquid to spread across or penetrate more easily the surface of a solid.
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Any of a group of surface-active agents which, when added to a liquid, cause the liquid to spread more easily over, or to penetrate, a solid surface.
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A substance, such as a surfactant, that reduces the surface tension of a liquid, allowing it to spread across, and penetrate the surface of a solid.
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