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Surfactant: Surface Acting Agent - Material that can greatly reduce the surface tension of water when used in very low concentrations. Soap is a simple surfactant. Pesticide surfactants are nonionic (do not ionize, but will have a slight electrostatic charge due to the polarity of dissimilar atoms in the molecule), anionic (ionized, have a strong negative charge), or cationic (ionized, have a strong positive charge).