Having or decorated with columns; featuring columns as structural or ornamental elements.
From 'column' plus the adjectival suffix '-ed' meaning 'having' or 'furnished with.' This is a straightforward English construction that can be applied to any noun to create an adjective describing something that possesses that thing. The suffix '-ed' in this sense became productive in English around the Middle English period.
The word 'columned' appears in every architectural description of Greek temples and neoclassical buildings, yet it's so ordinary we rarely notice it—a reminder that sometimes the most useful words are the ones we take completely for granted.
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