Columnar

a.

1.

Formed in columns; having the form of a column or columns; like the shaft of a column. 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 ->

Adj.	1.	columnar - having the form of a column; "trees with columned trunks"; "columnar forms"; "a columnlike tree trunk" Synonyms: columniform, columnlike
	2.	columnar - characterized by columns; "columnar construction"

columned, columniform, columnlike