Something apparently seen, heard, or sensed, but having no physical reality; a ghost or apparition; something elusive or delusive, a ghostly appearing figure, something existing in perception only, adjective_ something apparently sensed but having no physical reality, illusive, Believed to be real even though illusory
A dream arousing feelings of intense fear, horror, and distress, An oppressed state during sleep, accompanied by a feeling of intense fear, horror, or anxiety, or of inability to escape from some threatened danger or from pursuing phantoms or monsters. Also called incubus, a situation resembling a terrifying dream