Any of a series of secretive layers of cells found in the uterus, parts of the anus and eye, the male urethra and vas deferens and in parts of the pharynx.

plural of columnist

Having the form of a column.

(botany) Bearing columns.

Lacking columns.

(architecture) An arrangement or grouping of columns

someone who belongs to a group that secretly undermines another organization

The state or quality of being columnar.

plural of columniation

By columns; one column at a time.