phantom phantom /ˈfænəm/

adjective

1. () Something apparently sensed but having no physical reality  ( phantom )
   something apparently sensed but having no physical reality
    Seemed to hear faint phantom bells
   seemed to hear faint phantom bells
    The amputee's illusion of a phantom limb
   the amputee's illusion of a phantom limb
   

noun

1. () A ghostly appearing figure  ( fantasm , phantasm , phantasma , apparition , phantom , specter [American] , spectre [Canadian, British] )
   a ghostly appearing figure
    We were unprepared for the apparition that confronted us
   we were unprepared for the apparition that confronted us
   
   
2. () Something existing in perception only  ( apparition , fantasm , phantasm , phantasma , phantom , shadow )
   something existing in perception only
    A ghostly apparition at midnight
   a ghostly apparition at midnight