shaped like a column.
characterized by columns: columnar architecture.
Also, columnal. printed, arranged, etc., in columns: data in columnar form.

1720–30; < Late Latin columnāris, equivalent to column(a) column + -āris -ar1

columnarity [kol-uhm-nar-i-tee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
column (ˈkɒləm)
1.  an upright post or pillar usually having a cylindrical shaft, a base, and a capital
2.  a.  a form or structure in the shape of a column: a column of air
 b.  a monument
3.  a row, line, or file, as of people in a queue
4.  military a narrow formation in which individuals or units follow one behind the other
5.  journalism
 a.  any of two or more vertical sections of type on a printed page, esp on a newspaper page
 b.  a regular article or feature in a paper: the fashion column
6.  a vertical array of numbers or mathematical terms
7.  botany a long structure in a flower, such as that of an orchid, consisting of the united stamens and style
8.  anatomy, zoology any elongated structure, such as a tract of grey matter in the spinal cord or the stalk of a crinoid
[C15: from Latin columna, from columen top, peak; related to Latin collis hill]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1728, from L.L. columnaris, from columna "column" (see column).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Foam, plastic cups, or cardboard boxes will also protect the tender tips of columnar cactus if you're not a knitter.
The mucous lining of the lacrimal sac and nasolacrimal duct is covered with columnar epithelium, which in places is ciliated.
The library is a long room, with apsidal ends set off behind columnar screens.
Columnar cacti and other succulents that hold water in their leaves and stems thrive in the area.
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