In classical architecture, a projecting ledge or cornice, particularly the molding that extends from the top of a classical building or temple.
From Greek 'geison' meaning cornice or ledge. This term appears in classical architectural treatises and describes specific elements of ancient Greek and Roman buildings.
The geison is one of those architectural details that seems simple but was incredibly complex—Greek temples had dozens of special names for different decorative and structural elements, showing ancient builders were engineers as much as artists.
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