Definition from Wiktionary, the free dictionary
See also Phantom
Alternative forms 
- fantom (archaic)
phantom (plural phantoms)
- Something apparently seen, heard, or sensed, but having no physical reality; a ghost or apparition; something elusive or delusive.
- An image that appears only in the mind; an illusion.
Derived terms 
something having no physical reality
- “phantom” in Douglas Harper, Online Etymology Dictionary (2001).