bonded phase

in chromatography
https://doi.org/10.1351/goldbook.B00700
A stationary phase which is covalently bonded to the support particles or to the inside wall of the column tubing.
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 823 [Terms] [Paper]