oeil-de-boeuf


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bull’s-eye

bull’s-eye, 2
1. A figure or ornament of concentric bands.
2. A round or oval aperture, open, louvered, or glazed; an oculus or oeil-de-boeuf
3. The enclosure of such an aperture, a double-arched frame with two or four key voussoirs.
4. A circular aperture in a masonry wall; usually formed by voussoirs or tapered bricks.