open-tubular column

in chromatography
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.
Orange Book, 2nd ed., p. 97 [Terms] [Book]
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 831 [Terms] [Paper]