COLUMNAR

columnar

(adjective) characterized by columns; “columnar construction”

columniform, columnar, columnlike

(adjective) having the form of a column; “trees with columniform trunks”; “columnar forms”; “a columnlike tree trunk”

Source: WordNet® 3.1

Etymology

Adjective

columnar (not comparable)

Having the shape of a column.

Constructed with columns.

Source: Wiktionary

Co*lum"*nar, a. Etym: [L. columnaris, fr. columna.]

Definition: 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 priismatic 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.

Source: Webster’s Unabridged Dictionary 1913 Edition