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scanner (n.)

1550s, "person who examines critically," agent noun from scan (v.). From 1927 as a type of mechanical device, in mid-20c. use especially of radar and medical devices; later of computer accessories.

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Definitions of scanner from WordNet

scanner (n.)
someone who scans verse to determine the number and prosodic value of the syllables;
scanner (n.)
an electronic device that generates a digital representation of an image for data input to a computer;
Synonyms: digital scanner / image scanner
scanner (n.)
a radar dish that rotates or oscillates in order to scan a broad area;
scanner (n.)
a radio receiver that moves automatically across some selected range of frequencies looking for some signal or condition;
they used scanners to monitor police radio channels
Synonyms: electronic scanner
From wordnet.princeton.edu