a. [f. COLUMN + -AL.] = COLUMNAR.
1767. J. Bush, Hibernia Cur. (1769), 59. Most curious columnal combination.
1777. Hamilton, Volcanos, in Phil. Trans., LXVIII. 4. Lavas that have taken the columnal form.
1801. Southey, Thalaba, XII. xi. Crag overhanging, nor columnal rock Cast its dark outline there.
