surfactant (surface active agent)
A substance which lowers the @S06192@ of the medium in which it is dissolved, and/or the @I03088@ with other phases, and, accordingly, is positively adsorbed at the liquid/vapour and/or at other interfaces.
PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 611 [Terms] [Paper]