open-tubular column

in chromatography
https://doi.org/10.1351/goldbook.O04297
A column, usually having a small diameter, in which either the inner tube wall, or a liquid or @A00109@ held stationary on the tube wall acts as the stationary phase and there is an open, unrestricted path for the mobile phase.
Sources:
Orange Book, 2nd ed., p. 97 [Terms]
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 831 [Terms] [Paper]