Columnar epithelium

Columnar epithelium
Columnar Co*lum"nar, a. [L. columnaris, fr. columna.] Formed in columns; having the form of a column or columns; like the shaft of a column. [1913 Webster]

{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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Columnar — Co*lum nar, a. [L. columnaris, fr. columna.] Formed in columns; having the form of a column or columns; like the shaft of a column. [1913 Webster] {Columnar epithelium} (Anat.), epithelium in which the cells are prismatic in form, and set upright …   The Collaborative International Dictionary of English

  • Columnar structure — Columnar Co*lum nar, a. [L. columnaris, fr. columna.] Formed in columns; having the form of a column or columns; like the shaft of a column. [1913 Webster] {Columnar epithelium} (Anat.), epithelium in which the cells are prismatic in form, and… …   The Collaborative International Dictionary of English

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  • Epithelium — The outside layer of cells that covers all the free, open surfaces of the body including the skin, and mucous membranes that communicate with the outside of the body. By contrast the endothelium is the layer of cells lining the closed internal… …   Medical dictionary

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