any admixture to a liquid for increasing its ability to penetrate, or spread over the surface of, a given material, especially cloth, paper, or leather.
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Origin of wetting agent
First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for wetting agent
chem any substance added to a liquid to lower its surface tension and thus increase its ability to spread across or penetrate into a solid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012