Ghost definition from American Heritage Dictionary

[Chronos]

ghost       (gōst)

The spirit of a dead person, especially one believed to appear in bodily likeness to living persons or to haunt former habitats.
The center of spiritual life; the soul.
A demon or spirit.
A returning or haunting memory or image.

A slight or faint trace: just a ghost of a smile.
The tiniest bit: not a ghost of a chance.
A secondary image on a television or radar screen caused by reflected waves.
A displaced image in a photograph caused by the optical system of the camera.
A false spectral line caused by imperfections in the diffraction grating.
A displaced image in a mirror caused by reflection from the front of the glass.
A nonexistent publication listed in bibliographies.
A fictitious employee or business.
A faint, false image, as:
A secondary image on a television or radar screen caused by reflected waves.
A displaced image in a photograph caused by the optical system of the camera.
A false spectral line caused by imperfections in the diffraction grating.
A displaced image in a mirror caused by reflection from the front of the glass.
A nonexistent publication listed in bibliographies.
A fictitious employee or business.
Informal A ghostwriter.

A nonexistent publication listed in bibliographies.
A fictitious employee or business.