A mode of operation in which the sample is spotted at a point source at or near the middle of the plane and is carried outward in a circle by the mobile phase, also applied at that place.
Source:
PAC, 1993, 65, 819. 'Nomenclature for chromatography (IUPAC Recommendations 1993)' on page 829 (https://doi.org/10.1351/pac199365040819)