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plural architraves
(architecture) The lowest part of an entablature; rests on the capitals of the columns. examples
(architecture) The moldings (or other elements) framing a door, window or other rectangular opening. quotations examples
I know that one hinge of this door has parted with the woodwork. Dry rot has turned the architrave to compacted dust.
2016, Ian McEwan, Nutshell, Vintage, page 17