A ghost or apparition.
A placeholder for a pair of players when there are an odd number of pairs playing.
Something apparently seen, heard, or sensed, but having no physical reality; an image that appears only in the mind; an illusion or delusion.
A test object. A test phantom is an object that reproduces the characteristics of human tissue.
Illusive.
Fictitious or nonexistent.
A creature that is undead; that is, dead but still animate.
Those creatures which are undead; that is, dead yet still animate.
Being animate, though non-living.
Pertaining to a corpse, though having qualities of life.