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2 definitions found
 for Columnar
From The Collaborative International Dictionary of English v.0.48 :

  Columnar \Co*lum"nar\, 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]

From WordNet (r) 3.0 (2006) :

  columnar
      adj 1: having the form of a column; "trees with columniform
             trunks"; "columnar forms"; "a columnlike tree trunk"
             [syn: columniform, columnar, columnlike]
      2: characterized by columns; "columnar construction"

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