columnar

Formation into columns or pillars.

to provide with, or put in the form of, columns

Third-person singular simple present indicative form of columnate

present participle of columnate

A small, independent, military land unit capable of rapid mobility, often using guerrilla tactics against a larger force.

(anatomy) The vertebral column.

(mathematics) The vector space generated by all the column vectors of a matrix

A group of people which clandestinely undermines a larger group, such as a nation, to which it is expected to be loyal. / Used other than figuratively or idiomatically: see fifth, column.

(anatomy) The series of vertebrae that protect the spinal cord; the spinal column.