A
salt of a fatty acid, saturated or unsaturated, containing at least eight carbon atoms
or a mixture of such salts. A neat soap is a lamellar structure containing much (e.g.
75%) soap and little (e.g. 25%) water.
Source:
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 612