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a. [ L. columnaris, fr. columna. ] Formed in columns; having the form of a column or columns; like the shaft of a column. [ 1913 Webster ]

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. [ 1913 Webster ]

n. The state or quality of being columnar. [ 1913 Webster ]

a. Having columns; as, columnated temples. [ 1913 Webster ]

a. Having columns. [ 1913 Webster ]

Troas and Ilion's columned citadel. Tennyson. [ 1913 Webster ]

n. The employment or arrangement of columns in a structure. Gwilt. [ 1913 Webster ]

n. a journalist who writes or edits a regularly scheduled column{ 8 } in a periodical, usually in editorial style; a type of editorialist. [ RP ]

fifth columnist see fifth columnist in the vocabulary.

n. [ from a statement during the Spanish Civil War (1936) that the Falange had four columns of soldiers marching on the city, and a fifth column “already there” (i.e. sympathizers inside the Republican lines). ] 1. a group of persons inside the battle lines of a territory engaged in a conflict, who secretly sympathize with the enemy, and who engage in espionage or sabotage; -- sometimes also referred to as a trojan horse. [ RP ]

2. Hence, any faction of persons within a group who secretly sympathize with an enemy, especially those who engage in activities harmful to the group; an enemy in one's midst; a group of traitors. [ RP ]

a. Between columns or pillars; as, the intercolumnar fibers of Poupart's ligament; an intercolumnar statue. [ 1913 Webster ]

n. (Arch.) The clear space between two columns, measured at the bottom of their shafts. Gwilt. [ 1913 Webster ]

☞ It is customary to measure the intercolumniation in terms of the diameter of the shaft, taken also at the bottom. Different words, derived from the Greek, are in use to denote certain common proportions. They are: Pycnostyle, when the intercolumniation is of one and a half diameters; Systyle, of two diameters; Eustyle, of two and a quarter diameters; Diastyle, of three diameters; Aræostyle, of four or more, and so great that a wooden architrave has to be used instead of stone; Aræosystyle, when the intercolumniations are alternately systyle and aræostyle. [ 1913 Webster ]

adj. (Arch.) not having columns. [ Narrower terms: astylar; unpillared ] columned
Syn. -- uncolumned. [ WordNet 1.5 ]

n. A half column; a column bisected longitudinally, or along its axis. [ 1913 Webster ]

a. Like a semicolumn; flat on one side and round on the other; imperfectly columnar. [ 1913 Webster ]

a. (Geol.) Having an imperfect or interrupted columnar structure. [ 1913 Webster ]