n The disembodied soul; the soul or spirit of a deceased person; a spirit appearing after death; an apparition; a specter.
n Any faint shadowy semblance; an unsubstantial image; a phantom; a glimmering.
n A false image formed in a telescope, camera, or other optical device by reflection from the surfaces of one or more lenses.
n An unwanted image similar to and overlapping or adjacent to the main one on a television screen, caused by the transmitted image being received both directly and via reflection.