scanner Definition

1. A person or device that scans or can scan.
2. radar.
The rotating aerial by which the beam is made to scan an area.
3. computing.
Any device capable of recognizing characters, etc, in documents and generating signals corresponding to them, used especially to input text and graphics directly without the need for laborious keying.
4. medicine.
Any device that produces an image of an internal organ or body part, eg in order to locate a tumour.