A stationary phase in which is immobilized on the support particles, or on the inner wall of the column tubing e.g. by
in situ polymerization (cross-linking) after coating.
Source:
PAC, 1993, 65, 819. 'Nomenclature for chromatography (IUPAC Recommendations 1993)' on page 823 (https://doi.org/10.1351/pac199365040819)