Scanner

(noun.) 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'.

(noun.) a radar dish that rotates or oscillates in order to scan a broad area.

(noun.) an electronic device that generates a digital representation of an image for data input to a computer.

(noun.) someone who scans verse to determine the number and prosodic value of the syllables.

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