bull-s-eye
Bull's"-eye`, n. 1. (Naut.) Defn: 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. Dickens. 6. (Astron.) Defn: Aldebaran, a bright star in the eye of Taurus or the Bull. 7. (Archery & Gun.) Defn: The center of a target. 8. A thick knob or protuberance left on glass by the end of the pipe through which it was blown. 9. A small and thick old-fashioned watch. [Colloq.]