1. 扫描设备;扫描仪;扫描器
A scanner is a machine which is used to examine, identify, or record things, for example by using a beam of light, sound, or X-rays.

2. (用来将图片或文件复制到电脑上的)扫描仪
A scanner is a piece of computer equipment that you use for copying a picture or document onto a computer.

1. a radio receiver that moves automatically across some selected range of frequencies looking for some signal or condition

e.g. they used scanners to monitor police radio channels

Synonym: electronic scanner

2. a radar dish that rotates or oscillates in order to scan a broad area

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

Synonym: digital scannerimage scanner

4. someone who scans verse to determine the number and prosodic value of the syllables