wetting agent
surfactant that renders a surface wettable by water, or enhances the spreading of water over the surface
en-US/ˈhwɛdɪŋ ˈeɪd͡ʒənt/
en-GB/ˈwɛtɪŋ æʒɒn/
surfactant that renders a surface wettable by water, or enhances the spreading of water over the surface