Etymology
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columnar (adj.)

"having the form of a column; of or pertaining to a column," 1728, from Late Latin columnaris "rising in the form of a pillar," from columna "column" (see column).

updated on January 22, 2018

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Definitions of columnar from WordNet

columnar (adj.)
having the form of a column;
columnar forms
Synonyms: columniform / columnlike
columnar (adj.)
characterized by columns;
columnar construction
From wordnet.princeton.edu, not affiliated with etymonline.