architrave
US /ˈɑːr.kə.treɪv/
UK /ˈɑːr.kə.treɪv/

1.
the main beam resting across the tops of columns, specifically the lower part of an entablature.
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The ancient Greek temple featured a beautifully carved architrave.
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The architect carefully designed the proportions of the architrave to complement the columns.
2.
a molded frame around a doorway or window
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The ornate architrave around the grand entrance added to the building's elegance.
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He carefully installed the new wooden architrave around the window frame.