Relating to or resembling a chapiter or the capital of a column; architectural in nature.
From chapiter plus -al (from Latin -alis), a suffix creating adjectives meaning 'relating to' or 'pertaining to'.
The -al suffix is incredibly productive in English—you can add it to almost any noun to make an adjective: 'personal,' 'colonial,' 'chapitral'—showing how Latin patterns are baked into modern English.
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