fantasm

/ˈfæntæzəm/
noun
  1. A figment of the imagination; an illusion or unreal image.
    • The artist's painting captured a beautiful fantasm that seemed to float in the air.
    • The ghostly figure turned out to be just a fantasm of his tired mind.
    • In the desert heat, the oasis appeared as a shimmering fantasm.
Antonyms