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Definition of Bull's-eye
1. Noun. A lantern with a single opening and a sliding panel that can be closed to conceal the light.
Medical Definition of Bull's-eye
1.
1. A small circular or oval wooden block without sheaves, having a groove around it and a hole through it, used for connecting rigging.
2. A small round cloud, with a ruddy center, supposed by sailors to portend a storm.
3. A small thick disk of glass inserted in a deck, roof, floor, ship's side, etc, to let in light.
4. A circular or oval opening for air or light.
5. A lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself.
6.