Liquid chromatography in which the molecules are partitioned between a water-enriched layer, which is immobilised on a hydrophilic (polar) stationary phase, and a less-polar mobile phase, containing water and organic solvent.
Source:
PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 187 (https://doi.org/10.1515/pac-2017-0111)