Scanner

noun

1. A device which scans documents in order to convert them to a digital medium.

   "He put the picture in the scanner, then e-mailed a copy of it to his family."

2. A radio receiver which iterates through a sequence of frequencies to detect signal.
3. A device which uses radiation (ultrasound, X-ray, etc.) to generate images of tissue or surfaces for diagnostic purposes.
4. A device which uses optics to detect printed data (such as a barcode).
5. One who scans.