1. columnar - Adjective
2. columnar - Adjective Satellite
Formed in columns; having the form of a column or columns; like the shaft of a column.
Source: Webster's dictionaryMount Harris is of basaltic formation, but I could not observe any columnar regularity in it, although large blocks are exposed above the ground. The rock is extremely hard and sonorous. Charles Sturt
Further working along the lines of experiments of 1954 [toward rounded forms and columnar figures], I executed the 'Figure with upraised arms' as the crucifix for a Parish church in Salzburg. Fritz Wotruba
columnar construction Source: Internet
trees with columniform trunks Source: Internet
columnar forms Source: Internet
a columnlike tree trunk Source: Internet