a person or thing that scans; esp., any device used in television, optical character recognition, etc. for scanning
See scanner in American Heritage Dictionary 4
noun
One that scans.
A receiver that continuously broadcasts signals it detects from specified radio frequencies: heard about the robbery over the police officer's scanner.
An optical scanner.
A device, such as a CAT scanner or PET scanner, for observing internal organs, tissues, and other parts of the body,