[{"Bold_text": "noun", "List Items": ["Architecture.an area between the extradoses of two adjoining arches, or between the extrados of an arch and a perpendicular through the extrados at the springing line.", "(in a steel-framed building) a panellike area between the head of a window on level and the sill of a window immediately above.", "Philately.the decoration occupying the space at the corner of a stamp between the border and an oval or circular central design."]}]