adjective. having the form of a column.
adjective. characterized by columns.
1. Noun, singular or mass Each cell has a large, round nucleus, found at the base of each columnar cell or the side of the cell nearest the basement membrane. 2. Adjective In these offices the extra 3 inches of paper on a legal sheet can keep a legal document to a one-page length and hold more columnar entries for printed copies of record books. 3. Verb, non-3rd person singular present Due to their length, which results in a thick layer of cells, columnar epithelial cells offer a relatively high degree of protection while still allowing substances to cross their layers.