specter
n 1: a mental representation of some haunting experience; "he
looked like he had seen a ghost"; "it aroused specters
from his past" [syn: {ghost}, {shade}, {spook}, {wraith},
{spectre}]
2: an unusual appearing ghostly figure; "we were unprepared for
the apparition that confronted us" [syn: {apparition}, {phantom},
{spectre}]