Columnar (or epithelium) is a type of epithelial cell.
Columnar may also refer to: Columnar cacti, a descriptive term for smaller cacti Columnar database, a type of database which stores data tables by column rather than by row Columnar disposition, a technique in encryption Columnar jointing, a geological structure shaped as a regular array of polygonal prisms Columnar basalt, a type of rock formed during the cooling of a thick lava flow Columnar Peak, a subsidiary peak of Mount Garibaldi, British Columbia, Canada Columnar phase, a class of floating crystals which can exist in a cylindrical shape Columnar Valley, a valley in Victoria Land, eastern Antarctica
See also Column (disambiguation) Columnaria, an extinct genus of rugose coral Columnarios, silver coins that were minted by Spain from 1732 to 1773 Columnaris, a symptom of disease in fish caused by the Flavobacterium columnare bacterium