Columnar

Definition of Columnar

Co`lum´nar

Columnar epithelium
(Anat.) epithelium in which the cells are prismatic in form, and set upright on the surface they cover.

Columnar structure
(Geol.) a structure consisting of more or less regular columns, usually six-sided, but sometimes with eight or more sides. The columns are often fractured transversely, with a cup joint, showing a concave surface above. This structure is characteristic of certain igneous rocks, as basalt, and is due to contraction in cooling.<- as at Giant's Causeway, Ireland ->

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