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 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.
Informal A ghostwriter.
A nonexistent publication listed in bibliographies.
A fictitious employee or business.
Physiology A red blood cell having no hemoglobin.
Informal To engage in ghostwriting.
To move noiselessly like a ghost: "Two young deer ghosted out of the woods” ( Nancy M. Debevoise).
Informal To ghostwrite: was hired to ghost the memoirs of a famous executive.