a small circular or oval wooden block without sheaves, having a groove around it and a hole through it, used for connecting rigging.-a small round cloud, with a ruddy center, supposed by sailors to portend a storm.-a small thick disk of glass inserted in a deck, roof, floor, ship's side, etc., to let in light.-a circular or oval opening for air or light.-a lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself.-aldebaran, a bright star in the eye of taurus or the bull.-the center of a target.-a thick knob or protuberance left on glass by the end of the pipe through which it was blown.-a small and thick old-fashioned watch.