noun

1. A ghost or apparition.

2. Something apparently seen, heard, or sensed, but having no physical reality; an image that appears only in the mind; an illusion or delusion.

3. A placeholder for a pair of players when there are an odd number of pairs playing.

Synonyms: ghost

adjective

1. Illusive.

2. Fictitious or nonexistent.

   “a phantom limb”