Having the shape or form of a column; resembling a pillar or tall, straight cylinder.
From Latin columna 'column' + -form (meaning 'having the shape of,' from forma 'shape'). This Latin-based combination became standard in scientific and architectural terminology to describe column-like shapes.
Columnar cacti, certain deep-sea corals, and even some mushrooms are columniform—evolution keeps inventing the column shape because it's so efficient for reaching toward light or resisting wind. Nature loves columns as much as architects do!
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