Decorated with or featuring an architrave; having an architrave as part of its structure.
From 'architrave' plus the past participle suffix '-ed', creating an adjective meaning 'having been provided with an architrave.' This pattern allows any noun to become an adjective describing something possessing that feature.
The suffix '-ed' is magical in English because it lets you turn any noun into an adjective meaning 'having that thing'—you can say a doorway is 'architraved' the same way you'd say a ceiling is 'coffered' or a wall is 'paneled.'
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